I tend to agree with Varmint HunterÂ… IÂ’d choose a .30/06 because of a wider choice of bullet weights together with a slightly larger bullet diameter for the bearsÂ… and a .270 Winchester is nothing more than a .30/06 cartridge case necked down to .277 inches.
You should remember that black bears weighing up to 1,000 pounds or more have been recorded in Pennsylvania. While a good many black bears aren’t nearly that big, obviously SOME of ‘em are!
There’s very few species of North American game animals that couldn’t be very successfully hunted with a .30/06… especially with Hornady’s “light magnum” cartridge which turn a .30/06 into a cartridge ballistically superior to the .300 Holland & Holland Magnum!!!
That said, a standard .30/06 loading using a 150 grain quality bullet is perfect, flat-shooting antelope or deer “medicine” for either mulies or white-tails while a premium bullet, like the Nosler Partition, weighing 180 grains is plenty sufficient for black bear, caribou, elk or even moose. And, if you don’t feel confident in the regular loading of the .30/06, then go to the 180 grain bullet in the Hornady Light Magnum loading.
However, the .270 Winchester IS a bit more “flat-shooting” and is easily capable of taking black bears, caribou, elk and moose as well. Buttttttt… if I had my “druthers”, I’d “druther” have a rifle in the .30/06 Springfield cartridge than a .270 Winchester.
I hope I haven’t added to any confusion you might have had. In the final analysis, it’s a “close call” and you couldn’t go wrong with EITHER cartridge.
Oh… by the way, I don’t own a rifle in EITHER cartridge, so I’m not speaking from any “prejudice”.
Strength & HonorÂ…
Ron T.