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Here are some of the results from my trip to the range today, all groups were five round sets of each load:
11.7gr of AA #1680, 220gr Sierra HPBT, 1089fps
All rounds ejected, cycled and the bolt locked back after the last round.
10.5gr of AA #1680, 150gr Hornady FMJ, 1095fps
All rounds ejected and cycled, but the bolt did not lock back after last round.
8.3gr of H110, 150gr Hornady FMJ, 1113fps
All rounds ejected, none were cycled, and the bolt did not lock back.
These were fired from a M1S upper with less than 100 rounds through it, using Pmags. Accuracy is still around 3-4", so that will be the next step to work on.
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