i was charged twice just a couple of months ago.give or take.. by a big grizzly boar.the last charge was from 60 - 70 yards to a screetching halt at about 35 (37 paces).i can only stress that i suggest anyone carrying a gun for close quarters defense against big bear look into a automatic 12 bore shotgun.the only context i can estimate the speed of this thing was comparing his rate of closing against my 2 dogs who where standing beside him before he bolted at me.adrenalin causes everything to slow down but by the time he had stopped,stood up and did a spastic sort of swaying with his front paws and i had lowered my rifle to get a better visual,the dogs where still ru nning to catch up.i can expect most peoples motor skills to deteriorate in such circumstances.pumps are easy to short stroke unless alot of training is undertaken.another thing to keep in mind is,you probably will smell a bear before you see him a close contact ranges so trust your senses