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I have not shot much lately, but my owners manual said .451" for the .44 C&B revolver ....... and use enough borebutter/crisco to seal the chambers. I always used 20gr charges in my brass framed '51, 25 or 30 for the steel '60.
Never had a chainfire, and the crisco makes the fouling much softer-easier to wipe off. It is messy while shooting, though. Grease and real black powder- I don't think it would be the same experience without them ......
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