I think that the old soldier .30-06 is a great all-around cartridge for just about most any N. American game. Having said that I will go so far to say that I think it is a bit much for deer sized game (personal opinion). Not saying it's a bad choice at all, or excessive. What I mean is that if someone is going to stricktly hunt only deer sized or smaller game, you don't need a large over-bored caliber rifle. Those things can ealisly be cleanly killed with a .243 win, .250 Savage, .25-06 Rem, 6mm Rem, 6.5X55mm Swed. Mauser, 7X57mm Mauser, 7mm-08 rem. 30-30. etc.
I've had the misfortune of knowing a few guys who hunt pronghorn and deer with both .300 Rem Ultra Mag. and .300 Win Mag. Please I know for a fact that these guys can't shoot accurately enough to take advantage of those rifles effeciveness beyond 100 yards. Even so, inside 200yrds those cartridges are still just way too destructive on such a light framed/thin skinned animal to really do anyone any good.
I think a lot of guys out there hunting today were just never taught how to properly match the cartridge to their game. Too many inexperinced hunters are so obsessed with taking that unrealistic ultra long range shot that they buy too big of a gun and never learn how to stalk or close in on an animal to get within a reasonable shooting distance. It's supposed to be hunting, not sniping!! M21 sniper rifles with those huge complicated scopes are for military snipers, and used to pick off the enemy at 500+ yards, they are not for hunting game animals. It goes to show that too many of todays gun writers have way too much influence over some guys who just simply don't know what their doing in the first place. ,)
But this is the land of the free, so people can use any caliber they want so long as it meets the minimum legal requirements.