The Creedmoor Forum

Creedmoor Technical Info => Gunsmithing => Topic started by: autoxforfun on February 26, 2021, 06:48:58 PM

Title: 6mm CM Barrel Replacement
Post by: autoxforfun on February 26, 2021, 06:48:58 PM
I had just over 1100 rounds down the Shilen 6mm CM barrel.  It was starting to not shoot well so I thought I better look at the throat and the lands.  There are a couple shots of the area just beyond the neck juncture and a couple of what the lands look like.  I think this is the worst barrel that I've been responsible for creating.  I did a lot of load development with this barrel as it was the first 6CM that I shot.  I hope to get a more productive life out of the next one.
Title: Re: 6mm CM Barrel Replacement
Post by: jvw2008 on February 26, 2021, 07:24:56 PM
Looks kinda nasty. It would be interesting to see some pics of those same areas after all of the carbon was scrubbed out.
Title: Re: 6mm CM Barrel Replacement
Post by: autoxforfun on February 26, 2021, 07:33:29 PM
Looks kinda nasty. It would be interesting to see some pics of those same areas after all of the carbon was scrubbed out.
 
Jerry, I saw the carbon as well.  I didn't do a thorough cleaning the last time since I was not expecting to keep the barrel in service.  I did a quick pass to get the gross stuff out.  But if you think it would be worth it and may indicate that the barrel is still serviceable, then I'm willing to invest the time and complete the cleaning.  What really concerned me was how washed out the lands were...they looked in pretty back shape.  But once you got a bit past the start, the rifling looked in pretty good shape.
Title: Re: 6mm CM Barrel Replacement
Post by: gman47564 on February 26, 2021, 07:43:12 PM
Pm sent..
Title: Re: 6mm CM Barrel Replacement
Post by: jvw2008 on February 26, 2021, 08:27:47 PM

Jerry, I saw the carbon as well.  I didn't do a thorough cleaning the last time since I was not expecting to keep the barrel in service.  I did a quick pass to get the gross stuff out.  But if you think it would be worth it and may indicate that the barrel is still serviceable, then I'm willing to invest the time and complete the cleaning.  What really concerned me was how washed out the lands were...they looked in pretty back shape.  But once you got a bit past the start, the rifling looked in pretty good shape.

You might check with Grant regarding his recent experience.
Title: Re: 6mm CM Barrel Replacement
Post by: Ranger 188 on February 26, 2021, 09:01:58 PM
I'm pretty sure Grant is telling him that now.
Title: Re: 6mm CM Barrel Replacement
Post by: autoxforfun on February 26, 2021, 11:12:52 PM
We have a plan....stay tuned for an update.   :D
Title: Re: 6mm CM Barrel Replacement
Post by: jvw2008 on February 27, 2021, 09:42:04 AM
Need to see the “after” pictures. 😊
Title: Re: 6mm CM Barrel Replacement
Post by: autoxforfun on February 27, 2021, 02:14:56 PM
Need to see the “after” pictures. 😊
 
 I got up this morning with a mission....once if finished my coffee.

As I had mentioned, the initial pictures were done after a very cursory cleaning.  What I was looking at was all of the firecracking....which looked pretty bad. 

First off, I really appreciate the 'gentle' prodding from Jerry and Grant....nicely done !!

I broke my next steps into two.  First, I was going to go thru my normal regiment of cleaning which is using Boretech  Eliminator, Cooper cleaner and finally the Carbon Remover.  I use a nylon brush with each product and end with a light oiling and final dry patch.  I wanted to see how this looked as a good baseline.  Those pictures are attached to this post.  As you can see, the carbon cleaned up nicely in the neck area but the throat and lands still looked to be in bad shape.

The second step was to follow the guidance provided by Grant to be more aggressive and use Kroil, JB Paste and a bronze brush....and put your back into so to speak.  I did that and did a final wash with Kroil before drying and final light oiling.  Those pictures are shown in the next post.
Title: Re: 6mm CM Barrel Replacement
Post by: autoxforfun on February 27, 2021, 02:22:13 PM
Need to see the “after” pictures. 😊
 
 Here are the pictures after the Kroil/JB Paste and elbow grease treatment.  I must say, I was surprised at how well this all cleaned up.  This was accomplished by a combination of full strokes of the brush thru the barrel and back.  I then did a number of short strokes just in the first 8" or so to focus on the throat/lands.

I hope this helps some others in their approach to barrel cleaning.  A couple learnings for me:
1) My normal regiment is probably good for most cleanings
2) Keep an eye on the throat and if it starts looking rough, then a periodic Kroil/JB Paste cycle should be done.

Again, a big thanks to Grant and Jerry for their guidance and coaching......
Title: Re: 6mm CM Barrel Replacement
Post by: gman47564 on February 27, 2021, 02:30:57 PM
 :D
Title: Re: 6mm CM Barrel Replacement
Post by: Ranger 188 on February 27, 2021, 02:41:01 PM
Looks like a different barrel.  :o
Grant is the "barrel whisperer"
Title: Re: 6mm CM Barrel Replacement
Post by: jvw2008 on February 27, 2021, 03:27:02 PM
Plan on giving that barrel about 20 rounds before assessing if it will still perform for you. 😊

You may have to adjust your seating depth because you have removed a lot of hard core carbon from the anterior of the lands - probably somewhere in the neighborhood of 5 thousandths.

It will also rebuild that carbon faster then it did when new.

Take  home message: never try to read fire cracking through a layer of carbon.
Title: Re: 6mm CM Barrel Replacement
Post by: autoxforfun on February 27, 2021, 05:09:54 PM
I've been mostly concerned about the carbon ring and no so much on the lighter carbon build up.  So do you recommend getting all of the carbon out at each cleaning or is some build up OK?
Title: Re: 6mm CM Barrel Replacement
Post by: gman47564 on February 27, 2021, 05:14:44 PM
I agree with jerry.. it will take 15 or 20 rounds for it to come back in.. i didnt have to change my seating depth on the rifles i cleaned like that but they all had a long jump to the lands any way.. i find with a long jump that seating depth is more forgiving than being up there close to the lands..

Just hope it comes back in for ya and shoots good again for a few hundred more rounds..

I do have a question for ya bob.. you have probably told me before but what speed are you running this barrel..
Title: Re: 6mm CM Barrel Replacement
Post by: gman47564 on February 27, 2021, 05:25:13 PM
This is just my opinion bob.. but as carbon gets built up theirs NO solvents that will get all the carbon out.. and through normal cleaning that burnt in hard carbon builds up a little more each time.. to the point you look in there after what you think was a good cleaning and you see all kinds of fire cracking and think well its about time for a new pipe.. when in reality that fire cracking is layers upon layers of carbon that is cracking.. i have started taking mine back down to bare metal every couple hundred rounds.. havnt been doing it long enough to see if it extends barrel life or not yet.. but one thing it has showed me is that i dont have to keep chasing the tune..
Title: Re: 6mm CM Barrel Replacement
Post by: autoxforfun on February 27, 2021, 05:59:30 PM
I agree with jerry.. it will take 15 or 20 rounds for it to come back in.. i didnt have to change my seating depth on the rifles i cleaned like that but they all had a long jump to the lands any way.. i find with a long jump that seating depth is more forgiving than being up there close to the lands..

Just hope it comes back in for ya and shoots good again for a few hundred more rounds..

I do have a question for ya bob.. you have probably told me before but what speed are you running this barrel..
 
 Needing ~20 rounds to come back in makes sense.  It usually takes 5-10 after my normal cleaning.  This is the 6CM that I'm working with on the 110g A-Tips which look to like a lot of jump, so don't expect to see much change....but will be watchful.  I've been running them at either 2930ish or recently at 3025ish.  I've been using RL-23 which I hear may be a bit dirtier.

I have a 600 yard NBRSA match tomorrow and seeing this got my attention.  So I pulled the two guns I plan on using tomorrow (6mm Grendel and 6.5CM) and checked them for carbon.  They look a lot better.   Some lite coloring but little to no firecracking and the land transition look clean.  So not going to do anything with them but will keep an eye out for any further build up.  I did check the other 6CM and it looked fine as well but it only has a couple hundred rounds down it.

This was a good exercise to know what to look for and steps to take. 
Title: Re: 6mm CM Barrel Replacement
Post by: jvw2008 on February 27, 2021, 06:12:55 PM
I've been mostly concerned about the carbon ring and no so much on the lighter carbon build up.  So do you recommend getting all of the carbon out at each cleaning or is some build up OK?

Seems that different barrels like different levels of “dirty”. Some barrels after a routine cleaning don’t truly settle in for 20-30 rounds. Others are ready to go after 3 foulers. That may be because of different starting levels of clean, but I believe it has more to do with a happy amount of coppering for that particular barrel. That may vary with the type of rifling and the particular bullet being used.
Title: Re: 6mm CM Barrel Replacement
Post by: jvw2008 on February 27, 2021, 06:15:31 PM
Bob based on your reports of how that rifle has performed, it doesn’t seem that you should consider a different cleaning protocol. Maybe just a very thorough scrub every once in a while.
Title: Re: 6mm CM Barrel Replacement
Post by: autoxforfun on February 27, 2021, 06:25:14 PM
Bob based on your reports of how that rifle has performed, it doesn’t seem that you should consider a different cleaning protocol. Maybe just a very thorough scrub every once in a while.
 
 Jerry, that is what I'm thinking as well.  After checking some other rifles, they seemed in good shape.  But at this level of carbon, the rifle was not shooting well.....so I learned something and interested to see if it comes back to shooting well.
Title: Re: 6mm CM Barrel Replacement
Post by: gman47564 on February 27, 2021, 06:26:34 PM

 Needing ~20 rounds to come back in makes sense.  It usually takes 5-10 after my normal cleaning.  This is the 6CM that I'm working with on the 110g A-Tips which look to like a lot of jump, so don't expect to see much change....but will be watchful.  I've been running them at either 2930ish or recently at 3025ish.  I've been using RL-23 which I hear may be a bit dirtier.

I have a 600 yard NBRSA match tomorrow and seeing this got my attention.  So I pulled the two guns I plan on using tomorrow (6mm Grendel and 6.5CM) and checked them for carbon.  They look a lot better.   Some lite coloring but little to no firecracking and the land transition look clean.  So not going to do anything with them but will keep an eye out for any further build up.  I did check the other 6CM and it looked fine as well but it only has a couple hundred rounds down it.

This was a good exercise to know what to look for and steps to take.


The reason i asked about the speed was i thought you were using re23 in it and it does seem to burn dirty at the lower charges.. kick it up there and it will burn alot cleaner..
Title: Re: 6mm CM Barrel Replacement
Post by: jvw2008 on February 27, 2021, 06:42:17 PM
Can you imagine trying to understand the changes in this barrel without a bore scope?
Title: Re: 6mm CM Barrel Replacement
Post by: gman47564 on February 27, 2021, 06:46:48 PM
impossible.... lol
Title: Re: 6mm CM Barrel Replacement
Post by: autoxforfun on February 27, 2021, 06:50:33 PM
Can you imagine trying to understand the changes in this barrel without a bore scope?
 
 I was thinking the same thing.  Being able to 'see' what is going on is invaluable. 
Title: Re: 6mm CM Barrel Replacement
Post by: gman47564 on February 27, 2021, 07:00:17 PM
makes a guy wonder how many barrels get pitched when they really need a good deep cleaning..
Title: Re: 6mm CM Barrel Replacement
Post by: mnbogboy on February 27, 2021, 07:16:05 PM
Since I switched from JB to iosso I have found it takes much less elbow grease to get down to base metal...100 strokesis good but 200 is batter.
Title: Re: 6mm CM Barrel Replacement
Post by: autoxforfun on February 27, 2021, 07:42:55 PM
makes a guy wonder how many barrels get pitched when they really need a good deep cleaning..
 
 Exactly.  And how do you have a meaningful discussion around the topic without it just being speculation.  Without the pictures from the bore scope, this thread would have not been as useful.
Title: Re: 6mm CM Barrel Replacement
Post by: gman47564 on February 27, 2021, 07:52:10 PM
i was going to start a thread on this a few weeks ago but figured i would get laughed off the forum... lol... so i called jerry instead to see if he thought i was crazy... lol
Title: Re: 6mm CM Barrel Replacement
Post by: jvw2008 on February 27, 2021, 08:56:10 PM
Just to jerk his chain, I told him he was crazy as a loon. Had him goin for a while. 😂 Told him it was a good thing he didn’t post that cause he would get laughed off the forum. Then I had a pang of conscience and told him the truth. Grants experience was a good reminder for me though and I’m glad he shared his findings.

I’ve been looking through some sort of bore scope since 2016 when I bought a Larry Willis. Shortly after getting it I sent some pics of what I thought was a severely fire cracked barrel to a gunsmith friend. He laughed at me and said there’s nothing wrong there that won’t clean up! He was right and JB has been my friend ever since.
Title: Re: 6mm CM Barrel Replacement
Post by: z on February 28, 2021, 12:37:30 AM
Thanks for the post and the pictures.  Very educational.
Title: Re: 6mm CM Barrel Replacement
Post by: sportacus on February 28, 2021, 05:37:56 AM
Excellent thread!  Very useful tip/technique.
Title: Re: 6mm CM Barrel Replacement
Post by: Gone Fishin on March 01, 2021, 08:40:11 PM
Grant ,  Would you care to outline the process in a little detail for us "slow" folks on the forum? 
May be having the same problem in a 25-06 I picked up.   Don't believe the gun has been shot a great deal, but I'm not sure it had ever been cleaned.  It has what seems to be carbon ring and a little of the cracked appearance in the beginning of the lands.   I also recently bought the bore scope recommended on this forum...so I am not sure of exactly what I see but it does look exactly like pictures of the carbon ring and fire cracking I have found on-line.
thanks
Title: Re: 6mm CM Barrel Replacement
Post by: HufD63 on March 01, 2021, 09:26:38 PM
Ill let Grant outline his regimine as it seems very effective. I find cleaning a barrel when it's warm or even borderline hot sure takes a lot of the work out of getting one clean. I think it helps a lot on the carbon ring and the throat area especially.
Title: Re: 6mm CM Barrel Replacement
Post by: gman47564 on March 01, 2021, 09:27:51 PM
Gone fishing i will start a thread on what i have been doing to get that hard carbon out tomorrow evening.. its my bed time now. Lol
Title: Re: 6mm CM Barrel Replacement
Post by: gman47564 on March 05, 2021, 05:57:47 PM
Bob im curious if you have had a chance to run any rounds through this gun since you cleaned the carbon out..
Title: Re: 6mm CM Barrel Replacement
Post by: autoxforfun on March 05, 2021, 07:56:09 PM
Hi Grant.  Not yet.   I shot in a NCPPRC practice today which required a chassis rifle.  So I shot the white MDT 6.5CM.  I need to get some rounds down that barrel so I can do some serious load development.  Then I have a NBRSA practice on Monday that I want to shoot the 6.5-284 to validate some loads at 1000 yards.  Once I get past these two, then I think I will be able to get out and try the 6CM.  The problem with having all of these rifles to choose from is that it takes time to shoot them all....lol....I'm not complaining.  So nice to be retired.  They are predicting rain here for much of next week, so it may be toward the weekend before I can get out.  I am curious as well to see how this barrel behaves.  Definitely update the thread with what I find out.
Title: Re: 6mm CM Barrel Replacement
Post by: HufD63 on March 06, 2021, 11:50:07 AM
I hear you Bob, I'm looking at 3 guns and about over 8 barrels trying to pick the easy ones. Think I have it narrowed down, the Savage Dasher only has one, the Panda is getting a shakedown with the 47L imp and for the sake of keeping it easy I'm going to tuneup some Barts or Carpenters on my Borden Krieger from last season.
I've got a new 4 groove Lilja for the Borden but it needs broke in and I'd like to use my Alpha BRA brass in it that's yet to be turned so I'll leave it for now.
This seems like the only way of having a prayer of being ready for Deep Creek in 3 weeks without quitting my job 😂
Title: Re: 6mm CM Barrel Replacement
Post by: jvw2008 on March 06, 2021, 01:45:06 PM
Sounds like several late nights and early mornings for both of you.  Hang in there and be glad you have components to work with. 👍
Title: Re: 6mm CM Barrel Replacement
Post by: HufD63 on March 06, 2021, 03:04:21 PM
Sounds like several late nights and early mornings for both of you.  Hang in there and be glad you have components to work with. 👍

Plenty of options there as well.....
Title: Re: 6mm CM Barrel Replacement
Post by: Ranger 188 on March 06, 2021, 03:29:14 PM
That's why I retired young. Always said, work got in the way
of my shooting...
Title: Re: 6mm CM Barrel Replacement
Post by: jvw2008 on March 06, 2021, 03:34:03 PM
I need to re-acquire some of the work ethic I had before I retired. 😊
Title: Re: 6mm CM Barrel Replacement
Post by: gman47564 on March 06, 2021, 04:41:12 PM
Theres good and bad with multiple sticks.. if your shooting alot and running 4 or 5 then theirs always reloading to do.. when your running one or two and shooting alot your always screwing new pipes on and getting them tuned.. i prefer multiple sticks..  course i always have reloading to do.. 3 different calibers here and their ready for a bath..
Title: Re: 6mm CM Barrel Replacement
Post by: autoxforfun on March 06, 2021, 07:06:09 PM
Theres good and bad with multiple sticks.. if your shooting alot and running 4 or 5 then theirs always reloading to do.. when your running one or two and shooting alot your always screwing new pipes on and getting them tuned.. i prefer multiple sticks..  course i always have reloading to do.. 3 different calibers here and their ready for a bath..
 
 lol....I know what you mean.  If I'm not shooting, them I spending a lot of time reloading......the more you shoot the more reloading you need to do.  I agree that multiple sticks is better than breaking in new barrels.
Title: Re: 6mm CM Barrel Replacement
Post by: autoxforfun on March 29, 2021, 06:02:56 PM
The past week has been busy but wanted to get the 6mm CM back out and see how it shot after the cleaning regiment that Grant proposed.  I was at the first race of the season over the weekend, got home Sunday night and then headed to the Benchrest practice sessions that we have on Monday morning.  This week was going to 600  yards, which I thought would be a good test.

I shot 30 rounds total.  The first 10 were sighters/foulers.  I then started shooting 5 shot groups.  I finished with a few extra sighters to check on some wind changes.  The first 5 shot group was 4.5".  The second group was 2" and the last group was 1 7/8"  For the practices, the pit just uses a ruler....so 1/16 is the most resolution they will provide.   I used a load that I had good results early in the barrel's like which was RL-23 and Bart's Infinity 105g bullets.  It appears that the barrel will still shoot well.  I did my normal cleaning and there were signs of build up so I think I'll definitely need to keep an eye on it.

I attached a photo from the race.....my little beast ran well....set fast time of day for both days.
Title: Re: 6mm CM Barrel Replacement
Post by: gman47564 on March 29, 2021, 06:20:58 PM
Thanks for letting us know how it did bob.. 👍
Title: Re: 6mm CM Barrel Replacement
Post by: Ranger 188 on March 29, 2021, 07:54:33 PM
Bob, don't know anything about your racing.
What class is that?
I see an assortment of different cars there.
Title: Re: 6mm CM Barrel Replacement
Post by: autoxforfun on March 29, 2021, 08:19:10 PM
Bob, don't know anything about your racing.
What class is that?
I see an assortment of different cars there.
 
 What I do is Autocross or Solo and is part of SCCA (Sports Car Club of America).  You find a large area to setup a course based on pylons that is like a small road course.  Each car runs the course and competes on best time.  There are a lot of difference classes from street cars to fully prepped (ie Modified) cars.  They may run at the same time but each class is scored separately.  Top speeds are in the 80 mph range with car control/handling being the key factor.  It is a sport that brings a lot of different people together to share in they love of driving well.  There is a Nationals event each year in the midwest that draws 1300 competitors over 4 days of competition.   It is a way to keep the budget down but still enjoy some on the limit driving.

Here is a link to the SCCA home page.  https://www.scca.com/pages/what-is-autocross

Here is a link to some in car footage of me from a few years ago of me running an event on an abandoned air field here in CA.
https://www.youtube.com/watch?v=WdRL0p-M2Sk
Title: Re: 6mm CM Barrel Replacement
Post by: gman47564 on March 29, 2021, 08:34:27 PM
.  I did my normal cleaning and there were signs of build up so I think I'll definitely need to keep an eye on it


Bob its my opinion that even with a brand new barrel from the very first shots the hard carbon build up starts.. we clean them with solvents the best we can but theres some left behind.. then we shoot some more.. and clean it again and again theirs a little more stacked on top of what was there.. this cycle continues over and over to the point we have to change are load a little to compensate for the build up we dont really realize is in there.. gun still shooting good but changes to the load are having to be made to keep up with it and finally the hard carbon builds up so much you cant keep up with it.. its toast.. well probably not as you have seen now.. now that you cleaned it like you did it doesnt suprise me a bit that the load you had early in its life shot well.. with mine im going to continue doing my normal cleaning for 3 or 400 rounds and then im going to strip it back down again to bare metal.. after seeing that all that fire cracking can come out of there and how well the barrel looks after a 1000+ rounds im not sure that carbon doesnt act as a protectant to the steel.. but as we know their comes a time it has to come out or screw a new pipe on.. all my opinion.. but i firmly believe it.. lol
Title: Re: 6mm CM Barrel Replacement
Post by: autoxforfun on March 29, 2021, 10:38:04 PM
.  I did my normal cleaning and there were signs of build up so I think I'll definitely need to keep an eye on it


Bob its my opinion that even with a brand new barrel from the very first shots the hard carbon build up starts.. we clean them with solvents the best we can but theres some left behind.. then we shoot some more.. and clean it again and again theirs a little more stacked on top of what was there.. this cycle continues over and over to the point we have to change are load a little to compensate for the build up we dont really realize is in there.. gun still shooting good but changes to the load are having to be made to keep up with it and finally the hard carbon builds up so much you cant keep up with it.. its toast.. well probably not as you have seen now.. now that you cleaned it like you did it doesnt suprise me a bit that the load you had early in its life shot well.. with mine im going to continue doing my normal cleaning for 3 or 400 rounds and then im going to strip it back down again to bare metal.. after seeing that all that fire cracking can come out of there and how well the barrel looks after a 1000+ rounds im not sure that carbon doesnt act as a protectant to the steel.. but as we know their comes a time it has to come out or screw a new pipe on.. all my opinion.. but i firmly believe it.. lol
 
I agree with your line of thinking.  I am trying to adjust my cleaning regiment to see if I can maintain a level of carbon versus needing to take back to bare metal.  But if that doesn't work out, I'm in line with you in terms of periodic  deep cleanings. 
Title: Re: 6mm CM Barrel Replacement
Post by: HufD63 on March 30, 2021, 06:59:55 PM

.........  I am trying to adjust my cleaning regiment to see if I can maintain a level of carbon versus needing to take back to bare metal. 

I with this school of thought and have changed my regimen so far this season.

It can be done IMO and I have no desire to take one back to bare metal, I still patch it outwith solvent to get it loosened up then hit it with a bronze brush. 10 - 20 strokes then patch that out and run a JB patch on a jag about 30 strokes. 10 or so in the throat, 10 or so at the muzzle and 10 or so full strokes then patch it out with solvent.
I do this after every match or every 2 - 3 ladders. Last year the barrels I was running had me convinced they liked to be fouled in good and dirty. This years barrels seem to like staying on the clean side. So far it seems.
It's been working for me.
Title: Re: 6mm CM Barrel Replacement
Post by: mnbogboy on March 30, 2021, 07:33:23 PM
The past week has been busy but wanted to get the 6mm CM back out and see how it shot after the cleaning regiment that Grant proposed.  I was at the first race of the season over the weekend, got home Sunday night and then headed to the Benchrest practice sessions that we have on Monday morning.  This week was going to 600  yards, which I thought would be a good test.

I shot 30 rounds total.  The first 10 were sighters/foulers.  I then started shooting 5 shot groups.  I finished with a few extra sighters to check on some wind changes.  The first 5 shot group was 4.5".  The second group was 2" and the last group was 1 7/8"  For the practices, the pit just uses a ruler....so 1/16 is the most resolution they will provide.   I used a load that I had good results early in the barrel's like which was RL-23 and Bart's Infinity 105g bullets.  It appears that the barrel will still shoot well.  I did my normal cleaning and there were signs of build up so I think I'll definitely need to keep an eye on it.

I attached a photo from the race.....my little beast ran well....set fast time of day for both days.
glad things went well for you bob do they ever televise autocross?
Title: Re: 6mm CM Barrel Replacement
Post by: autoxforfun on March 30, 2021, 10:51:25 PM
Randy, it is not much of a spectator sport....so I have not seen one televised.  That being said, they do stream the Nationals from the SCCA website which is run the week after Labor Day weekend.  Also, there are some other events that you might find on-line such as the Good-Guys series and the Optima Challenge series.  Both are gaining a higher level of visibility....but not on any broadcast stations.
Title: Re: 6mm CM Barrel Replacement
Post by: mnbogboy on March 31, 2021, 09:13:29 AM
Randy, it is not much of a spectator sport....so I have not seen one televised.  That being said, they do stream the Nationals from the SCCA website which is run the week after Labor Day weekend.  Also, there are some other events that you might find on-line such as the Good-Guys series and the Optima Challenge series.  Both are gaining a higher level of visibility....but not on any broadcast stations.
i just watched a youtube vid of some nice classic cars giving it a go, a cherry 55 chev post and a nice A body chevelle (68-72) also 70s camero and firebird. Intetesting to watch looks like fun never ends. Some "rat rods" also in the mix.
Title: Re: 6mm CM Barrel Replacement
Post by: autoxforfun on May 10, 2021, 06:58:10 PM
I've been looking for a way to keep a barrel from getting as carboned up as what I did to my 6mm CM barrel.   It was demonstrated by Grant that the use of J-B Bore Cleaner had the ability to take the barrel pretty much back to bare metal.  After using this, I then tried something in addition.  I have put over 100 rounds down the barrel and it has been easier to clean and the signs of heavy carbon don't seem to be coming back.  Still a bit early for sure but so far I've been pleased.    What id tried after the Bore Clean was to use the J-B Bore Bright.  It seems to be more of a polish versus a remover.  So I followed the directions and so far the barrel is shooting well and the clean up is much easier.  I guess time will tell.
Title: Re: 6mm CM Barrel Replacement
Post by: gman47564 on May 10, 2021, 07:36:50 PM
 thank you for posting this information bob... i will have to get a tub of that...
Title: Re: 6mm CM Barrel Replacement
Post by: autoxforfun on May 10, 2021, 07:48:17 PM
thank you for posting this information bob... i will have to get a tub of that...
 
For sure.  Also, follow the directions...they warn about inadvertently  polishing the chamber...not a good idea since the case does need to have something it can grab onto.  Would be good to get more test cases.....