5 years ago there was no 30TC only 30-06 and .308. I went with .308 and still would today because of versatility and ease of loading. There are many hand loads which give great performance with selected bullets from 110 to 180 gr. If you drop your ammo overboard in a swamp, you can usually get .308 factory loads in nearly any gas station out in hunting country. One could argue the same with 30-06, but the velocity increases are minimal with more recoil and more muzzle flash out of a 15 inch barrel. Even rifle length barrels shoot bullets which drop. It's still a matter of trajectory, terminal velocity, terminal performance, accuracy, and bullet placement. Gene