As already mentioned, you can load 45 Super equivalents in acp cases. At the pressures I'm comfortable with in a S&W revolver, 45Colt has no advantage over 45acp. Published data gets me 250gr at 930fps, 200gr at 1100fps in a five-inch barrel, and it's easy to exceed those numbers without damaging the gun. Those are chronographed figures, by the way, not the fiction published by powder manufacurers and ammo companies.
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