Some 5.56 cases are heavier than some commercial, and vice versa, you just have to weigh them.
As posted, military 5.56 cases are used extensively to make .300 BLK cases with. Works just fine.
As always, start low and work up your load. Case weights have always been a part of rifle loading. I log the case weights on .223 cases. There can be quite a difference.
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