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Understanding my Reloads....

2269 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)

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As other guys have said, I agree completely with borrowing a chronograph and also trying some first run bullets. Blems are blems for a reason. A chronograph will really tell you what's going on with the overall consistency of a load and you can also compare that with your actual group size on paper. Personally, I would not be concerned about differentiating between tenths of a grain in powder charge difference until you have first shot groups in .5 grain increases. Furthermore, even though each rifle is it's own unique animal in what it prefers, I have found that middle of the road powder charges generally provide the best accuracy for me. 41.5 grains of IMR 4895 has been known to generally produce excellent results, although out of your specific rifle it might be different.
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