First, Take a deep, slow breath and make sure your weapon is ready.Don't run..or move much.

IF the bear is REALLY intent on mauling-killing you and it's not just a bluff charge, wait until it's within 15 yards...ESP with a 12 gauge..

Kneeling position is best as it's stable position...and more inline with the bear's chest and head.You'll either die or kill the bear..You'll have time at 12 yards to rack the pumpgun and shoot again once after the initial shot to the face.Jim