Magnum bob, I have two of them, the original factory 54 is my go to just because it shoots well, 1 1/2 at 100yards and it has one of favorite scopes of it, burris FF 6x. The second rifle was original 50cal barrel was rusted out. I Got the gun for 50 bucks. I had it rebored to 54 ,same outside barrel diameter by taylor machice. The bore on it is tight and it is tough to seat a 45 cal bullet in a 54 cal sabot. I have not shot it much. 44 cal bullets in a 54 cal sabot are easier to seat but do not shot well at all. I may try 451. 45 acp bullets and see how it does Both guns are set up for 209 primers. I do not like the tupperware stocks but they get me by as is.