you are out of your mind if you think a brown bear is 1500lbs. its mostly fur that makes it LOOK big, its mostly all fur . male lions are actually the same size as brown bears.
first post goes through very detailed data
https://www.quora.com/Who-would-win-a-fight-between-a-lion-and-a-grizzly-bear
the lion has a much more powerful bite, and bigger teeth as well.
Grizzly Bear | National Wildlife Federation
LET'S NOT ACT LIKE THEY DON'T GET THAT BIG. YOU USE AVERAGE THE WEIGHT ACROSS ALL GRIZZLY BEARS ACROSS NORTH AMERICA ON THIS. THAT WOULD BE SIMILAR TO USING TERRIER STATS WHEN TALKING ABOUT PIT BULLS. PICK A LION AND PICK A GRIZZLY. THERE ARE WAY TOO MANY TYPES OF BROWN BEARS WITH WAY DIFFERENT CHARACTERISTICS TO PLAY THAT GAME OF AVERAGES.
WE TALKING ABOUT THE BIG ASS GRIZZLY BEARS VS. THE KING OF THE JUNGLE LION. NOW STOP BEING SILLY.