As Trooper said, you can run them through a sizing die. I just did this only with a 45 Colt. My only RB mold for 44 C&B revolvers is .457 but I do have a .454 sizing die. It was no trouble to size the RB's to .454 and lightly crimp them on the little shank the sizing die put on them. In the 3rd Gen Colt I shot them in they weren't particularly accurate over Red Dot.

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