I finally found it after 3 years searching! First its not that stupid canned Lion hunt everybody has seen. Its part of an adventure movie made by Ronald "Don" Shanin called "African Safari", released in 1964. The sequence is real, and he is charged by a scraggy goat killer male from about 30 yards or so. He fires three shots from a bolt gun, looks like a Pre-64 Model 70. The lion is jinking as he fires and he nails it on the third shot, hitting the spine. He is knocked over by the lion which dies on top of him. You can see him actually get flattened by the lion. I, personally would have crapped myself on this one.

Google Indian Paint African Safari to find it....its a double feature DVD.

BS