If you reload you can make 45 Colt level loads in 45 ACP or 45 AR cases, with 255 LSWC bullets and some medium slow powder. If you don't reload you can buy some warm 255 Gr 45 AR ammunition from Buffalo Bore and probably some others. Something you can do to make your 625 shoot "45 Colt" while you're looking for resources to convert it.

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Tom
"Panem et Circenses"