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Jim answered your question & is right .44 caliber C&B Revolvers Bore Grove diameter is .449 - .454 depending on Brand & model so it will shoot a .45Colt round quite nicely but since you haven't mentioned this I figured I'd mention it.
Those Conversion cylinders are made to be used in a Steel Framed revolver not a Brass framed one so if your revolver's frame is made of steel it will work very nicely & will last a life time, if they are used in a Brass framed revolver the higher pressures can shorten the life of the revolver
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