Skip to main content

  Who's Online

  • Guests: 43
  • Hidden: 0
  • Users Online : 4

  Search

Welcome to this community for the Creedmoor metallic cartridges enthusiasts. We have been sharing information here since February 2010 and have grown quite a bit since. Please join us and share your experiences with the Creedmoor cartridges, and also please spread the word about the forum. As we continue growing, the forum will become an even greater resource for all of us.


Recent Posts
11
General Discussion / Re: What distance?
Last post by LeadHammer -
It’s a bit gusty off and on, so I’m doing 100. At least it’s mostly headwind, from 1:30 ish. If I get a good spot I will move back to 200. My third adjustment from zero got me a 3 shot 3/8” group
13
General Discussion / Re: Got me a new rig..
Last post by gman47564 -
Rainy ole day here today so i decided to fabricate a front bumper for the mini.. built it out of 2 inch square tubing .. the little truck had this little tow hook mounted to each side of the frame.  So i took them off and fabricated brackets that would bolt in their place.. quiet a chore getting the holes all layed out on the brackets im here to tell ya.. lol  but it turned out good.. will let it weather a little then paint it black..
15
Reloading / Re: Seating depth update thoughts
Last post by HufD63 -
It never ceases to amaze me how guys will wear a barrel out testing powder then when It comes time to test seating they start taking shortcuts.

Getting centered in a seating node will shrink groups by half or more. If everything else is "right" with your set up and bench manners it will shape up those weird looking groups and can pull those "one outs" in within reason. If you run in increments of .003" you will eventually roll into the nodes, if you run bigger increments there's a chance you'll skip over nodes. The bigger the increment the better the chance  you are skipping over them.
I agree you can tune powder very close but to get the absolute most accuracy out of any combination seating depth must be tested. There is a remote possibility you could pick the majic base to ogive measurement tune it with powder and be at the absolute most accurate seating depth but you will never know for sure without thouroghly testing it.

On the subject of nodes how wide of node do we really need? Aren't we looking for the most accurate node so we can find the center or sweet spot of that node where group size can be cut in half again.

I measured .014" of throat erosion in 1400+ rounds on a 6.5x47 Lapua Improved barrel recently. The barrel was still shoog very well even though I didn't do a very good job of keeping up with it. A barrel will favor the "position" of the bullet in the barrel. We are using the distance to the lands as a reference to locate that position in the barrel. Once this position is found many barrels, actually IMO most barrels will still shoot as accurately in spite of throat erosion to a great extent. Maybe not quite as accurate but still "in the node" accurate.

So while a node that's .002 or .003 wide may seem narrow in regards to throat erosion it stays constant by it's position in the chamber as it relates to barrel time I believe.
I've checked distance to the lands many times and found my throat had eroded but the gun was still maintaining the accuracy because of the position in the chamber not the distance to the lands.

Find the node in .003s fine tune it in .001s to find the sweet spot of the node. Keep shooting it in that position regardless of distance to the lands until accuracy degrades. If / when accuracy degrades check distance to the lands and adjust accordingly.
16
General Discussion / What distance?
Last post by LeadHammer -
I’m heading out to hopefully shoot my tuner.
What distance should I do? 1,2 or 300?
If it’s windy when I get there then I will disregard 300.
17
Reloading / Re: Compressed load question
Last post by LeadHammer -
Sometimes it may take a few tries as the powder can bridge up in one case and not in another. Also a longer drop tube and or a slower pour into the case can help create room for the powder.
18
Reloading / Re: Crimping
Last post by bob_atl -
What Gman said.
Also,  I crimp only those going into a semi-auto (for me thats 300BO, 223, 243, 6.5cm, 308).
I do it for reliable live round extraction in the field, not for SD.
Don't see an improvement in FPS SD.
19
Reloading / Re: Crimping
Last post by gman47564 -
Rj the thing to remember when using a crimping die is that every case has to be exactly the same length from the base to the mouth of the case.. not many that i know of on here use the crimp die.. but it never hurts to try one.. compare a few with a light crimp and some without and see what gives you the best results..

  Top Poster

HufD63 HufD63
6,276 Posts
gman47564 gman47564
6,119 Posts
jvw2008 jvw2008
6,091 Posts
Cold Trigger Finger Cold Trigger Finger
3,884 Posts
dadajack dadajack
3,230 Posts

  Top Boards

  Board Stats

  • Total Members: 5,675
  • Total Posts: 131,381
  • Total Topics: 11,094
  • Total Categories: 4
  • Total Boards: 18
  • Most Online: 458

  Forum Staff

txcas txcas
Administrator
dadajack dadajack
Global Moderator
HufD63 HufD63
Global Moderator
gman47564 gman47564
Global Moderator