New to this forum and have a question. I like the Ruger Single Actions. I recently got a bunch of stuff at an auction Vaquero in 45 Colt and included in one of the boxes was a Stainless cylinder for a BlackHawk I think. Caliber is what messes with my mind. It is not a 357 and not a 41... 40 S&W falls into the cylinder and I don't have any 10MM.. But am pretty certain it is for 10mm. 40 is just too short. Oh and it does fit momma's 45 Blackhawk convertible. Did Ruger make a revolver in 10MM? or some convertible Cylinder has been shot but not much. Kinda at a loss!