All will work just fine as long as the nutt behind the butt does his/her job.
Dober
Like the way you put it.
2 more cents from someone who has never shoot a bear. My 6mm Rem wouldn't be my first choice for 2 reasons. First I don't think the cartridge is adequate (I will admit I could be wrong on that point). Second I have 2 rifles that I feel are adequate.