I know of a number of hunters that have taken bison with a .30-06. It may be over 100 years old but that old cartrige is still going strong and I believe that the only one that has outsold it is the old .30-30
If a .30-06 is what you have available then by all means use it. It has more than enough power to take down a bison and a lot of other animals.
I just said in your other post that I like the 340 Weatherby but it is over gunned for a lot of the North American animals but so can be said of just about all the magnums out there. I also have a 30-06 that I used to take a lot of animals with. Mostly deer and elk and I never had a problem with it when I did my part on the shooting end of it.
i shot a huge buffalo bull with my .30-06. the first shot was thru and thru between two ribs on both sides, but got the lungs. the second shot may have missed but he only ran about 40 yards before going down. he weighed close to a ton. i shot a cow (meat hunt) with the .300 magnum. i actually saw it lift her up, thru the scope, off the ground at 90 yards. she only weighed in about 600 pounds. so yes, i would use my .30-06 again.
When it come to turkey calls some of us have only one or two. Then there are the ones that have and can't go in the turkey woods without at least a dozen or so. Remember that old calls still work. Just take a little time and freshen up your old style calling tactics.There are most likely more than a hundred types of turkey calls out there on the market. Just waiting for you to pull out the green and spend it on them. From Hunter's Specialties, Lynch, and even the famous Drury brothers calls...