I can squirrel hunt, call coyotes and pop groundhogs with any CF rifle caliber, and have. What I've been told in past years is that the few partakers of those hunts aren't the concern, it is the 100's of thousands of deer hunters on opening day brandishing high power rifles that scares the hebbie jebbies out of the rule makers. Thus, the big, heavy, slow projectiles for all these years. Only they couldn't quite regulate the new and improved offerings coming out every year to stretch the rifle barreled 12 gauge or the inline Muzzleloader's reach across the corn field. As deer hunter numbers have decreased Game Commissions have thought up new ways to keep selling tags and encouraging folks to go afield with the lessoning of these restrictions.