Long Range Hunting Online Magazine

Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels & Ballistics

Rifles, Bullets, Barrels & Ballistics Applied Ballistics


338 Snipe-Tac - Load Evaluation Wanted

LinkBack Thread Tools Display Modes
Unread 06-19-2008, 12:46 AM
Gold Member
Join Date: Sep 2003
Location: Nebraska
Posts: 810

I would anneal some cases and test them with the 138 load. Neck tension is a big factor
in these cases. The brass i sent you was necked from 408 brass and fire formed and prepped. They should be annealed after the first fireing as the necks get hard going through
the forming process. I had a customer that experienced similar results and it was magnified
at 1000yd shooting. He couldnt figure out why one day he would shoot lights out, 4-5" groups and the next time he went out the groups were larger and so on. The necks were getting hard from forming and reloading, his groups were mostly vertical. He annealed the necks and the same load went back to the original group size. Some longrange bench shooters anneal everytime they load, i would say these cases every three shots should suffice.

Your chamber neck size is .372 a loaded round should measure .368 or very close. The reamer is set for .015 max neck thickness

I agree with others, you should shoot the group in one setting as fast as possible, dont let the gun cool as it can change lots of peramiters. The carbon barrel cools very fast internally so fire them quickly. When i tested it that is what i did, i fired 3 shot volleys and dont let a loaded shell sit in the hot chamber too long. My chrono had them a little faster than yours is showing, 3300 was average with the 138 loading.

Measure the base of the case, ahead of the extractor cut on a case you havent shot before. record this...should be around .634 after firing it measure it again in the same spot.
.005 - .006 is the norm for a full load expansion. .640 would be a top load.

If you get a chance see if you can start to stretch the distance out, 500 - 700 yds

Another thing to try with the boron coated bullets is to take a soft cloth and wipe them off before loading to remove any excess boron. Very slick bullets can cause the ES to show up on the chrono. Coated solid bullets can have extreme spreads.


"Let the good times roll"
Reply With Quote

Unread 06-19-2008, 07:43 AM
Official LRH Sponsor
Join Date: Jul 2006
Location: Harrisburg, PA
Posts: 2,764
Dave is correct, you should anneal the cases.

I anneal my .338-.408 cases before fireforming, then again after every two firings.

I'm running .013 neck thickness, with .003" clearance in the chamber.

"Character is who you are when nobody is watching"
Reply With Quote
Unread 06-19-2008, 12:34 PM
Bronze Member
Join Date: Feb 2005
Location: North Idaho
Posts: 67
Dave and Joel, thank you for your help. I will anneal and do some rechecking/reshooting, hopefully this weekend. I'm always learning on this site... Thanks again. -- Don
-- Don Ferguson

Psalms 27:1
Reply With Quote


Thread Tools
Display Modes

Similar Threads for: 338 Snipe-Tac - Load Evaluation Wanted
Thread Thread Starter Forum Replies Last Post
Wanted : .204 Lee load sheet Sidesy Reloading 3 09-14-2010 03:20 PM
IOR Spartan Evaluation on Video CS T Long Range Scopes and Other Optics 3 01-07-2010 12:58 AM
Load evaluation Natty Bumpo Reloading 4 09-23-2008 08:32 AM
6.5x55 load data wanted tommy trucker Reloading 11 02-13-2006 06:25 AM
Realistic Evaluation General Discussion 5 03-17-2004 04:26 PM

All times are GMT -5. The time now is 11:05 PM.

All content ©2010-2015 Long Range Hunting, LLC