What kinda cartridges can I rebarrel my 300 RUM receiver to?? Can I go to a WSM family, or just say a 300 WM, what about your AX cartridges? I am looking for an efficient cartridge that will do what I want. 2000 rounds barrel life, elk killer to 800 at most, 1000 for targets and deer and coyotes. I dont want to burn more then about 75g's of powder. I also have a 700 in a 270 that could be redone, but its a blued action, I would rather have a stainless action for an all around rig.