I have an AR upper in 7.62x39 that shoots great with the basic Wolf/ Tula steel cased ammo and I thought it would be a great coyote gun . I live in Calif. so I need to hunt with non-lead projectiles which need speed to expand. I came across Cavity Back Bullets and they have a dedicated bullet for the 7.62x39 thats .310 , 125 grain and almost triples in expansion down at 1100 fps. Going to give them a try !