I'd take a 270win over any of those, but if that's not an option, then probably .30-06 with a 150gr, then maybe the .308, then next up maybe the .243

I can't help but think the more rules/regulations makes things worse, ie you can use a .30-06 but not a .270 etc...

I think WY has a law for bison of a min .27 caliber with 150gr bullet, something like that makes more sense than a bunch of regs.