M14 Forum banner

Understanding my Reloads....

2267 Views 29 Replies 18 Participants Last post by  Gen Jack Ripper
Yesterday I went to the range with my Bula XM21 and shot my second batch of reloads. Since these actually grouped much better than my first batch, I now have to understand what is going on with my loads because it does not make much sense to me. 40.5gr and 40.7gr grouped fairly well except the fliers and starts to open at 41 gr and 41.3 is like a shotgun, but then 41.5 grain grouped fairly well too. Its a bit confusing because I thought since 41.3gr did not group well than 41.5 gr would group like crap as well.. Which gr load should I stick with? I`m just trying to find what load my m1a likes the best. Thanks !

Midwayusa Blem 168gr Bullet
2015 Lake City Brass
CCI #34
Headspaced to 1.628
Brass Trim = 2.005
OAL = 2.82in
IMR 4895 from left to right in the picture (40.5gr,40.7gr,41gr,41.3gr,41.5)

See less See more
1 - 1 of 30 Posts
I have found that bullet type often times is more important than powder type & load. hth. you might try a better bullet.
As an arbitrary experiment, I switched my standard bullet (Nosler 168 BTHP) with a Sierra Match King, running IMR4895... my groups tightened up, not by much, but even I noticed a difference in my Socom16.

I quit the Ultimate Accuracy Chase many years ago, if the load I've worked up shows acceptable accuracy for what I want it to do, then I'm happy, call it a day, and crack open a beer.

OP, I would continue with your load development... I would load some more 41.5grn loads, and maybe 1 or 2 steps higher just to see if there isn't some more obvious improvement to be had. I would also reverse your testing... run the higher loads first, and then back down... to make sure a warming barrel didn't affect your test results, too.
1 - 1 of 30 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.