7600 Remington 30-06. For me its simple. For Grizzly protection a pump is the only thing that would give me more than one shot. The 7600 is as accurate as most bolt guns. I have used them forever and have complete confidence in them. The only option would be the same gun in 35 Whelen.

This said, if I had to walk much, I would be in more trouble than grizzlies. I am afraid those days are past for me. However if I could ride, it would be ok. If not for the range you set, the 45-70 would be a no brainer pick for me. I probably will go moose hunting in Canada but it will be in Sask and will be from a boat.