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What is with the "4-shot groups"? Doesn't the gun have six chambers?
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Because that is what I feel is necessary to get an idea of relative accuracy. My AR15 has a 30-rd magazine and I do not test handloads with 30-shot groups with it either. Even with 4-shot groups my right elbow was beat to snot from the recoil of shooting over 120 rds of .44mag from the bench on a rest (six batches/ladders of different bullet/powder combos with 5-6 steps of 4 rds each per test ladder). A higher rest would have been easier on me but I shot with what was at hand.