Quote:
Originally Posted by Muley Gil
"I could still shoot ACP individually w/o moon clips since I hate them anyway."
But would .45 ACP headspace on the .455 chamber mouth?
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Well I've never had a shaved 455 cylinder to actually try, I'll admit. But I have shortened 45 Colt cases, primed them and fired them reliably in a 45 ACP unmodified cylinder. What that told me was that although there is excess headspace for the 45 Colt, there was enough leeway in the firing pin travel to reliably ignite them.
So when I lined up 455 Colt, 455 Mk II and ACP cartridges, with the small difference in extra length of the 455 MK II over the ACP it appeared that the leeyway in firing pin travel would ignite the ACP. Although theoretical on my part.
Hopefully someone with an unmodified 455 cylinder could drop in an ACP and see how far it sticks out when headspaced on the 455 chamber shoulder.