L7A1 9mm proof-pressure ammo runs faster when cold, test finds
L7A1 high-pressure 9mm, the British submachine gun load ATF flagged in 1996, gained velocity after cold conditioning in a chronograph test rather than losing it.
Read the pieceWhat the measured world of chronographs and gel blocks is telling us, and who's telling it well.
L7A1 high-pressure 9mm, the British submachine gun load ATF flagged in 1996, gained velocity after cold conditioning in a chronograph test rather than losing it.
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Forty years of barstool ballistics, settled by people with chronographs and the patience to publish. What's left is preference — which is fine, if we'd only say so.
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