I would assume the barrel would be replaced on a .50. I would hope they don't use too slow a twist as best accuracy comes from something faster than 28", as in 24". Shilo and C. Sharps Arms use 36" which ar OK for hunting, I guess, but the accuracy really lacks compared to 24" twists. Green Mountain makes a Winchester taper for .50 cal. with a 24" twist. They also make it in the original Winchester .50-110 twist of 54", which is too slow actually, even for light 300gr. bullets - more of a round ball twist. One must be careful to get the faster twist. The resulting accuracy is a nice bonus.
: Another bonus with the .50, is it will give real world killing power with Black Powder if desired or needed. The case will hold 80gr. easily and a 520gr. bullet.