ORIGINAL: BS
http://www.mountainmolds.com/
Looks like a 400 grainer is about best in a 1-48 twist...........if you are going to shoot slugs, get a different barrel. 1in36 or faster, or be prepared to use a lot of powder and wading to get those big slugs to spin. And did I mention the kick.............[:'(]
The 435 would probably do better than the 460 with the 1:48 twist barrel. I think the hollow base would help also in getting a faster, better grip of the rifling. As to whether the twist is fast enough, it could be, depending on what Sharpshooter is trying to achieve. I have 1:48 Hawken and shot 370 maxiballs and 385 GP's into 3.5" patterns at 75 yards with it using 80 grains 3F BP. The optimum twist for 1:48 in a 50 cal. is around 300 grains. So the projectiles I was using, were even heavier than 435 in relation to the optimum weight for his .54. Now at120 yards, I bet I would havebeen all over the place with those slugs. But since all my hunting shots were under80 yards, really under 65 yards, I did very well with it, and it wouldn't have made sense to replace the barrel for the hunting I was doing and the shots I was taking.
Happy Hunting, Phil