Thanks for your input. I have since done some more research and decided that a 460 would blow the gun apart. I believe it has a pressure listed at 64,000 psi! I am now looking at either a .444, .375jdj, or a .38-55. I never thought it would be this tough to decide on a cartridge. I am looking basically to shoot a 200 or so grain bullet about 2500 fps tops.