a few decades ago we were hunting moose south of Mt. Mckinley in Alaska. My friend had taken a fine bull in the middle of a swamp and we finally got it packed out by evening. The next morning there was a grizzly boar on what remained of the carcass. I had a grizzly tag and began a stock. The wind and spruce tree cover were perfect for the stock. I got to the edge of the spruce cover and got a good gun rest on the side of a tree about 150 yards from the unaware bear. I put up my stock, ready for the easy shot, and saw the scope crosshairs were curved in appearance. Not understanding what the real problem was, I just centered the bear in the scope field. Easy shot at any other time, but the bear just looked up and then ran away to the right. What had happened is that an inside lens in the scope had become detached. I have no idea where my shot actually went. It was the first and last time I ever tried to shoot a grizzly I bumped into.