A .454 Casull with the right ammo in a 7.5" barrelled revolver has about 1900 ft.-lbs. of energy...of course it wouldn't have the range of a .243 shot from a rifle. As already mentioned, there's also the T/C Contender that you can get in a rifle calibre. The biggest and "baddest" revolver, the Smith & Wesson .500 has about 3000 ft.-lbs. of energy at the muzzle with the right ammo, about even with the .270 Winchester. The .243 with good 100 grain ammo from a 22" barrel sits about 2150 ft.-lbs. at the muzzle, and is generally recognized as being a good deer round out to 200 yards or a bit over.