I use 1800 fps as minimum impact velocity. Seems pretty standard for soft bullets. I currently hunt with the 210 Berger. It performed very well on two elk, one shot, pass through kills with good damage to lungs. Neither bull took more than a couple steps dead on his feet. Bigger should be better. My only kill with a 190 the bullet blew up. Lungs vaporized, too, so he dropped dead, but made me leery of hitting heavy muscle or bone. I'd guess impact velocity was 2500+- for those shots.