I expect it will shoot well. I have a 1980 New Model Blackhawk through whose forcing cones a .452” 265 gr WFNGC bullet slides through with almost no resistance. I haven’t measured the cones precisely, but they are factory. I find that 21 gr/296, new Starline brass, Federal 155 primer, shoots very small groups. A bit smaller than the same bullet with 8 gr/Unique.
Point being, your gun sounds quite similar and will likely shoot well with good bullets and a decent load. Do not expect the old soft lead 250 gr round nose bullets to shoot well; they are horrible in my revolver. Same for the cowboy action loads.
