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When I was new to loading, I measured a half-dozen factory rounds, commercial and G.I., and the average was .473", so I started there.
Ultimately, I settled on .470", as every round plunked and fed in every gun.
If you have a single .45, you could tailor OAL and crimp for that gun.
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Runs off at the mouth about anything 1911 related on this site and half the time is flat out wrong.
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