I don't think anybody can say the 30-06 is too much gun.
Yeah. I can...
And not for any particular game animal, but for many circumstances where critters are shot the 30-06 is simply too much rifle. Flat land where the rural roads are laid out in township grids, and a school bus or feed and seed truck can pass by anytime call for a rifle that has easily frangible bullets.
There simply is no reliably frangible bullet available in .308 diameter.
Thus my decades long affair with the .243, and more lately the 25-06.