Interesting comparison: I had an 8 3/8" M29 S&W and a 7 1/5" Ruger Super Blackhawk when I was in college, and also some of the Speer plastic ammo.
The bullets from the S&W would dent and actually slightly break the fibers of the plywood panels of an interior door but the same bullets frequently wouldn't even make it out of the Ruger's barrel. Apparently there was THAT MUCH difference in the smoothness or diameter of the two different bores, enough to make the bullets stick in the Ruger's barrel.
Regards, Joe
