That was the case with my grizzly charge. When the 3 yr old boar reached the point where I was sure that any closer would be too late, I emptied my 30-06 into him. His nose skidded to a stop no more than 20 ft from my toes, so had I hesitated any longer, he would have run over me, wounded or not. In those days, here in BC, 40 years ago, you could buy a grizzly tag over the counter, but that is no longer the case. Tags are issued on a lottery basis, so it could take years to get one. As you say, save your life and deal with the Conservation officer later.
About 20 years ago, a long time friend and hunting partner had a grizzly charge into his camp. He dropped it into the campfire, where another friend was stoking the fire as they had just returned. They left the bear on the spot, drove to Cranbrook to find the C.O., and brought him back to the camp. He cleared them of any offence, but took the carcass for study.
Also on the subject of grizzly charges, our own esteemed Thomas Steenburg was charged by one in the high country between Pemberton and Lillooet some years ago. He saw what he described as a "ship's wake" approaching at speed through the brush towards the trail he was hiking on. He clambered up the nearest substantial tree, with the bear clawing up after him. It actually hooked claws into his fanny pack and ripped it off, along with some small bits of his fanny! After what seemed like hours in the tree with the bear milling about the base, it finally left, and hours after that, Thomas climbed down and made a hasty retreat to his distant Land Rover. Ask him to show you his scars sometime.