In the early part of the last century,guys like Sheldon killed slews of grizzly,moose,sheep an assorted game in the Northern Rockies of Canada with the 6.5x55 or similar stuff. The Jacquot brothers who ran a Yukon outfit(IIRC)killed the same stuff with a 250 Savage.
Anectdotal but I know two guys from back here who have killed mountain grizzlies (one shot) with the 270-130 Nosler Partition,so no reason the 6.5 with good bullets would not do it.
I'll bet a buck lots of polar bears have been killed on a circumpolar basis with the 6.5x55 as well.
So there is no doubt it can be done.....just a question of are there better tools?
