A jacketed bullet should be .451. Pull one and see how it fits in the throat. If the wad cutters are .454 swagged they will go down the barrel anyway--just check every few shots for leading. If you lived next door I would loan you a sizer. I am thinking around 2.5 of Bullseye if seated flush.
Last edited by 4barrel; 02-29-2020 at 12:09 PM.
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