I must say, even though I LOVE MY .375 Ruger, I did take a decently big blackie with my .300win mag. He probably made it about 10 yards (he was flipping and kicking his legs , so he rolled about 10 yards. ) That thing smashed him also. In my experience (being of course, only talking about the direct contact I have had with bears as either the primary shooter or the backup shooter for a friend. ) that there was a measurable difference between the time it took for the bears to expire when shot with a powerful gun versus a normal hunting rifle. All the shots I have witnessed (25+) on black bears (no bear under 250lbs) showed me that the energy level imparted to the animal with the bigger gun definitely helped. Maybe this is not the norm as MANY people shoot with great success using 30-30's and .243wins. I just prefer giving the animal the respect it deserves and killing it as quickly as I can, using the gun that imparts the greatest level of smackdown I own. Anytime I ever shot a bear with a "sub-caliber" gun such as a .270 cal or lower, it was an incidental kill while out hunting a different species. One of the best things about the NWT is that there is no draw for game. Just being a resident allows you to get a moose, bear, wolverine, wolf tag over the counter. So I try to take a blackie each year, but rarely is my hunt centered on bear. Usually see one while moose hunting.