The '06 is so ubiquitous that it is likely to show up in the top of any 'I killed it with this' list. Anyone who thinks the '06 is inadequate on anything in North America given its track record over the past century is...well...(I'm trying not to call Elmer a fool). If anything, modern bullet tech has elevated the '06 to the only thing you need for the entire continent.

Buy a .30-06, a .223, a 12 gauge, and a .22 and go kill every game animal on the continent and never lack for anything caliber wise. Of course, that's not the rifle looney way.