Fired most of them before the ban and never really noticed any naturally accurate calibre, more the case that some pistols were just more difficult to shoot straight. .38 was an easy round to shoot, .357 similar but with a bit more poke, .44 was great fun but recoil was a bit too serious! Personally I could always shoot better with a revolver than any semi-auto. Getting all misty-eyed now...
Bruce