Idaho's one of the few places that allows that. It's a bad idea and causes problems with wounded animals.
It's a bad idea to use
any centerfire on any game, but I find "any centerfire" preferable to telling hunters they can't use certain centerfires on certain game ("24 caliber and above", "no .223", etc, etc). And I seriously doubt locations with such rules have any more wounded animals than in the neighboring areas. Most people tend towards magnumitis rather than the anemic, and you can't legislate good shooting, anyways.
