That's a neat way to convert to .45 Colt. It leaves the case unsupported a bit, but I imagine there would be no problems, considering the low pressures involved.

I like the 1918 cartridges too. I have a few Winchester .45 ACP cases, stamped "W 18", from 1918. According to the range managers, an older man would come out every few months and shoot a 1911 with WW I ammo. This was in the 1970s and there were few misfires.

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John 3:16
WAR EAGLE!