Id agree with the 50jrh. I have that and the smith and had a 500 linebaugh. The 500l is a very limited gun imho and expensive to get brass and buy bullets for. The smith is large and to take advantage of the extra case capacity you need at least the 8 3/8" barrell imho. With my 6.5" smith 500 i cannot really beat a jrh in velocity out of my sons bfr 7.5" barrel but the bfr has better tolerances as well and my bfr 460 7.5" barrel beats my smith 460 8 3/8" barrel by almost 100 fps. So that have something to do with it. The bfr is a little cheaper. Also the brass can be made from cut down 500 smith brass which no other 50 cal can claim and the bullet selection is by far better and the same as the smith but unlike the other single action platforms you have a slightly bigger cylinder and can use the big bullets. Thats what id do, in fact im gonna do it soon