Vern - I was once watching through binocs, a large brown bear flipping rocks on a hillside way above us - presumably for voles or pikas. Suddenly she turned and covered about 200 later paced yards in nothing flat- maybe 8 seconds, only to re-emerge a bit later with her new cubs from a brush thicket. I mean, she was stretched out and MOVING! I'd guess her at 9 foot or so. The rocks proved out to be an estimated 200 to 300 lbs, mostly... It impressed me.....
I've had the luck never to face a real charge, but I'm with Art. I'm shooting for center of mass, holding for forehead, center bottom of eyes (he's incoming, plus reaction time, plus velocity = probably good stuff)) And shooting a lot!, in the time allowed! With whatever I've got on hand at the time.
I'd really prefer I never...
