My experience hunting has been limited to one antelope doe. Specs are a 1-8" twist , 2965 fps muzzle velocity , range was 475 yds. This load will shoot .25" out of my gun. My concern came when I shot a wee high and back on this doe. She went right down so I was not concerned. When I got to her , I seen I had hit just at the spine, but a little lower in more meat than bone. The spine was not broken and I could see the bullet in the entrance wound. the jacket was all that was there and weighed 40 some grains. The thought of using it on game again has left me. I generally use 130gr JLK's or Bergers and will continue to use them instead..... after hearing about jacket failures , I will restrict the Hornadys to practice and such. They were cheaper and shoot great but 2-3" of penetration is not acceptable.....