Richards-Mason conversion bore diameters

[Bugscuffle]

Do the new Uberti and/or other cartridge conversions, open top, Richards-Mason, etc. have a .357 bore diameter or do they have the larger bores of the original Navy percussion revolvers?

[Pettifogger]

If they are Ubertis, they have the reduced bore diameters.  Don't know about the "and/or other cartridge conversions" since Uberti is the only one presently making these style guns.  If a cap and ball was converted by an individual or someone doing custom conversions you'll have to ask them whether they sleeved the barrel or not.