7mm mag or almost any .30 large bore caliber. Depending on recoil, and what u want to do with it as far as game there is a ton of options. You might as well have said what not to use. Either way don’t think u will go wrong with any magnum caliber out to 600 yards. One thing about it if you reload that opens the door even more. Some really good powder on the market compared to 16 years ago. Makes a lot of standard calibers shoot like magnums.