And I don't mean for a particular caliber. Have had increasing success getting cast bullets to shoot well out of revolvers as the size went up. .357 was a miserable failure. .41, so-so. .44 isn't too bad but takes lots of work. But the .45 Colt in several revolvers has been easy to get usable field pistol accuracy. Currently running a S&W 625 that is producing as good of scores as I've ever had in Field Pistol. (It's actually entered as a PHSC gun due to the fatory porting.) Seems to like just about any old thing that I've tried.

Any thoughts as to why the big bullets seem easier to shoot well?

Better seal as it goes down the tube I would assume. I'm not much of a lead shooter but from the reading I have done a good seal helps.

He refers to larger diameter bullets as in 45 is larger than 44, etc. The argument of larger diameter within that caliber choice such as .430 rather than .428 has been around a long time. Yes, the better the gas seal at the throat, the more likely to produce better accuracy----assuming other factors are correct.
Jonathan, we'll just have to see if there are any other post to support your experience. Richard

I get confused easy.

There seems to be not much drama in getting stout 30-20 and 32-20 cast bullet loads to work well out of Contenders, etc., so the big bore phenomenon might be revolver-centric. Or even S&W specific, but I've had about the same results in range testing the Colt Python vs. Anaconda. Anaconda does better than the Python with cast projectiles, but my sample size is just those two particular revolvers in that brand.

Somebody with a pile of Freedom Arms revolvers in the various calibers might have the best insight.