I'm not sure what slugging the bore really accomplishes. Mine is .432 and oversize hard casts don't shoot any better than standard .430 once you get over 300 grains. You cant change the twist rate by slugging the bore. I guess it depends on the gun and what distance you shoot at. I'm sure there might be a few 44's with a 1/38 twist that would shoot over 300 grains well but I certainly wouldn't buy a new one counting on it. If you only shoot 50 yards then its all a pretty moot point. At 100 things start to open up quit a bit.
