When I saw this kill on Mountain Men season 8 episode 9 "No Guts, No Glory" I was blown away. Made by Harry Youren of Idaho while chasing the running Bison from horseback. It happens so fast you barely get to see him draw the pistol and shoot. My question is what caliber do you think he used? I haven't been able to find a clip of the scene. To watch it I think you have to be able to watch the full episode of this current season. It's pretty unbelievable to me. Harry was hunting the Bison herd with his brother when the herd started to run. They decided Harry would flank them and push them back towards brother Kidd. I was not expecting Harry to suddenly draw a 1911 pistol and shoot a Bison. His shot was apparently a very good one and he took the animal easily, according to the editing. I wish I could find out what caliber his pistol was, but I have to assume it wasn't a 45acp. I don't think that was a very good decision even if it was 10mm, but it worked and sure made for good TV. I paused the frames best I could and it looks like he's got a Colt Delta Elite. Just my best guess.