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tight neck
Well after forming, trimming ....some 5.56 brass into 300-221 brass, I made some dummy cartridges.
I dropped them in the mag, I release the bolt, I try to extract, I try to extract, I TRY TO EXTRACT, I extract
What do you think, is stiff extraction of dummy round telling me that I can not use formed brass from 5.56?
Am I stuck with 221 Fireball brass?
Do I need to case my chamber?
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