Many, 45 acp rounds, Ive shot dont even have the muzzle energy to eject the chamber properly. Most rounds are made for home deffence. Their designed to limit penitration threw walls ext. As cool and full of power they may sound. Some have as little as 305 muzzle energy. Just because it says Remington, Hornady or what ever you want to hear; mean it has the right specs. Most 45’s come with domestic factory mods.Those are still domestic guns for domestic rounds.If I was to put 8 rounds of 475 muzzle energy extreme bear hollow tip rounds. Im preaty sure that bear will know the wild side of they 45 acp. Just use two hands, cuz these rounds arent as user friendly. I messed up my right wrist with one, single hand shot. They will hurt you if you get careless. Also keep in mind not all bears are the same.