I have shot a few big whitetail does with a 45 long colt lever gun using 300 grain wide flat point started at about 1500 fps., and frankly it flattens them. Smashes all bones and keeps on going . I believe the ones I used are about 20 brinnell and are from Montana Bullet Co
.These are very accurate in my rifle and have a gas check. I don't think it matters with regard to gas check , may help with accuracy.
