It has to be straight walled and I don't think the contender frame is really suitable for the 460 but idk. I already have dies and the 357 max can be loaded hotter than what the books say safely. From what I've read it'll out perform the 35 remington loaded right and could always be opened up to 358 bellm or something if laws change. I did think about 444 ill have to look into it some more i have dies for it as long as it has the trajectory but it burns more powder also.. So many considerations that's why I asked on here so I can be sure I get what I really want in the end. And I can always have my 10 inch 357 barrel re chambered heck I could do it myself wouldn't be nothing next to match chambers I've cut