Dude, I thought you had a 458 Lott. If that's the case, shooting it with the 458 WM stuff shouldn't be much of problem. Just clean it VERY thoroughly afterwards. I've always had a 458 WM around after beating myself up with 45/70 GORILLA loads out of my old Marlin a long time ago. Compared to the 45/70, the 458 WM was a just a push.