My old Win Mdl 70 270 purchased in 1952 killed pronghorn, mule deer, elk, and other unwonted critters mostly with reloaded ammo using 130 and 100 grain bullets. I dident need it but got a 308 Norma Mag , reloaded 165 grain bullets and shot pronghorn, mule deer, elk ,and a few unwonted critters with it. About twenty five years ago got a good buy on a 340 Weatherby Mag and shot a few elk with it. It was fun using the 308 and 340 Mag rifles but I could have killed the same critters with the 270 Win rifle . My brother in law who was somewhat older than I only used an army surplus 30-06 purchased from the NRA and shot Wyoming pronghorn, mule deer, and elk using factory ammo. So get a 270 or 30-06 and reload bullets to match the game . Reload 130, 140 and 150 grain bullets for the 270, and reloaded 165, and 180 grain bullets in the 30-06.