Looks like I'm a little late to the discussion, but I'ved killed a few using everything from .22 rim fire to .338 (hey, it was all I had at the time.) My favorite has been a 25-06 with a 87 gr hp, haluing ***. I have no idea why but it definitly anchors them, and foxes, and haven't had any, significant hide damage. I'm sure I'll blow the next one i hit with it all to hell, but I've dang near gutted 'em with a .223 40 gr vmax too.
That is my favorite, fast, bucks the wind a little better, and levels them better than .22 cal, imo. Never have used any .24's much but I would imagine thety pretty nuch do the same thing. Definitly feel more reccoil with the 25 tho.