just about anything will work but shoot enough elk and moose and you will probably prefer a 30-06 (minimum, has heavier bullets than 7mm), 300 "anything" magnum or a 338 win. I've pulled .308 dia 150 gr corelokt bullet out of a cow elk (i suspect it from 308 win) just didn't have enough power to drop the elk, it actually healed up, but the 300 h&h with 180gr silver tips proved quite different. also pulled a 150 gr boattail from a cow elk brisket all healed up didn't caliper the bullet but it was either 270 or 7mm, and again the 300 proved different.