I think the 6.5x55mm would work just fine, it's a great little cartridge, heck even the 6.5x57mm would be fun, perhaps more fun. But for the nostalgia who like history, I think the 7x57mm would be hard to beat; after all W.D.M "Karamojo" Bell killed 1011 Bull Elephants with one, all but 28 (Cows) were Bull's using a 7x57mm rifle, he also used a 6.5x54mm MS but found early on the 7x57mm performed a little better on big game at close range. W.D.M??... Weapon of Mass Destruction, no... but, I'm sure the big tuskers thought he was. Yeah, I think I'd stay with the 7x57mm I've owned a couple of Winchesters in that caliber over the years, I never felt I was under gunned.