why on Gods green earth would he need to fire a 10 shot group?????
my eyes arent as good as they once were but even I can see a 21shot group of around an inch or less with a 150 extreme spread......what I cannot see is any problem here??? given that there is a 2.5grn difference in powder weight to achieve that....again where is any issue for a sub 300 yard rifle???
load up 5 of the 41.5 5 of the 42 and 5 of the 42.5 if you really really really feel the need to waste some more components, go shoot them again minus chronic graph and make your decision based on whats most accurate...then STICK TO THAT LOAD....
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