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Topic: 135 vs 140 (Read 627 times) previous topic - next topic

135 vs 140

im wondering if i can expect the 135 gr a tip to run in the same node as a 140 gr. berger hybrid... any of you guys run any 135 gr. bullets in the 6.5 creedmoor and if so did you find the nodes to be close to the 140 class bullets?
Grant

Re: 135 vs 140

Reply #1
I had loaded 50 rounds to do a ladder and group test to compare with the 140.  But that was the box that I dumped and had to pull all of the bullets.  I've not reloaded them and now the ranges around here are closed.....so can't help you...wish I could.
Bob
If everything seems under control......you're just not going fast enough

Re: 135 vs 140

Reply #2
Thanks anyway bob.. i did a little testing with the atips today and it appears the node is just a little slower than the 140 bergers.. i think im going to find what im looking for right at 2800 to where the 140's like to run at 2820 in my stick.. i do think theirs a half node around 2845 with the atips but it appears to be really narrow.. to where the 2800 node is fairly wide.. still early in the game with a few more to send down range to get it sorted..
Grant

Re: 135 vs 140

Reply #3
Bullet weight, shape, and bearing surface all affect barrel vibrational harmonics. I would be amazed if the node doesn’t shift. It will be interesting to hear what you find. Let us know Grant.

Re: 135 vs 140

Reply #4
Well i kinda got preoccupied with the prc for a couple weeks their but got back to the 135 atips today.. 41.3 gr. Of re 16 is giving me 2800 fps with them and thats pretty much centered in the node.. their shooting bug holes at a hundred yards and inch and a half groups at 430.. thats without doing anything with seating depth.. could probably tighten it up with a small change there one way or the other.. pretty pleased with them.. probably wont replace my 140 berger hybrids with them but will add them to the rotation.. 😁
Grant

Re: 135 vs 140

Reply #5
Bullet weight, shape, and bearing surface all affect barrel vibrational harmonics. I would be amazed if the node doesn’t shift. It will be interesting to hear what you find. Let us know Grant.
I was expecting the same. I am in EU so limited to Vihtavuori / Norma powders.
My DT SRS 26” 1/7.5 likes 140 HT in front of 42.75 of N160, Lapua SRP brass CCI 450.
Tried the same recipe with A-tip 135 and, surprisingly, almost same good results.

Re: 135 vs 140

Reply #6
thought i would get back at the 135 atips today... get a little more serious about them... prepped my brass and turned the necks on 100 cases... instead of re 16 i went with h4350 today.... seated the bullets .020 off the lands... and did a 10 shot ladder test.... started at 41.1 gr and went to 42.9  which is pretty much max in my barrel.... no heavy bolt lift or ejector marks or anything like that but its another .02 or .04 gr. away...42.9 gave me 2868....  the nodes look pretty much the same as they did with re 16... a pretty wide one at 2800 and a narrow one at 2850...  42.5 and 42.7 showed 2850 so i loaded 42.6 and shot 3.... first two went in the same hole.... and shot the third one and thought it went in the same hole as well.... big grin on my face... thinking yep thats gonna work... 42.2 put 3 pretty much touching each other in a triangle... even though that wasnt in a flat spot... i wanted to see what they did at 2830 which is what 42.3 gave me for speed... any way went down to the target to admire my pretty little one hole group only to find it was a pretty little 2 hole group... the third one was a half inch high and left.... dead center of my orange target which has a black dot in the center of it ...lol  dang it... that was all i got to do with them today... will explore that 2800 node tomorrow and will post some pics of what i come up with if their worthy....
Grant

Re: 135 vs 140

Reply #7
May have the 135's sorted out.. too windy to test them at 300 today but its looking good at a 100 yards.. top is a 5 shot group and the other is my 10 shot velocity ladder.. 2800 mv is where they want to shoot with 41.9 gr. Of h4350
Grant

Re: 135 vs 140

Reply #8
Nice rifle piloting Grant. Fold that paper tear back and it will truly make some of us cry with envy! 😭
11X Grandfather
Part time Savagesmith

Re: 135 vs 140

Reply #9
thanks randy... wish that one hadnt of got out of there on me but it did...lol
Grant

Re: 135 vs 140

Reply #10
thanks randy... wish that one hadnt of got out of there on me but it did...lol
Well if it hadn't got out you would always wonder if maybe you completely missed the paper 4 times!
11X Grandfather
Part time Savagesmith

Re: 135 vs 140

Reply #11
lol... :)
Grant

Re: 135 vs 140

Reply #12
Got a chance to test this load at 300 and 430 today.. couldnt get it under 1/2 moa even with quiet a bit of seating depth testing.. so i switched gears and went to the 2850 flat spot my ladder showed and loaded up 4 at 42.6 gr. Of h4350.. shot them at 300.. let one go before i was ready but the other 3 show promise.. lol will work on them some more tomorrow..
Grant

Re: 135 vs 140

Reply #13
Couple more 4 shot groups at 300.. think at .001 neck tension im running too light.. got some more loaded with .002 tension.. will see if that helps a little.. plus these cases i have been using is at the end of their life.. the next ones i test will be with neck turned once fired brass.. dont know if it will help or not but gonna find out.. :D
Grant

Re: 135 vs 140

Reply #14
Try a few different bushings for neck tension test.
The last 1 I preformed I used .286 - .289.
I normally use a .288, that particular load shot in the high .3's, while the .286 was a low .2.
I have the 123 scenar set out far enough and with enough neck tension you can see the preasure ring 2/3 of the way down the neck.