Hey Joel.
I havent used them on game yet.
Took my 243 this year.
When I was testing them this summer, they made a noticeably louder sound on a gong than a 170 from a 30-30 at 50m. Another shooter came over to ask what I was using. He was shocked to hear 7.62x39. He figured much larger caliber.
It may just be a softer bullet transferring all its energy instead of deflecting off the gong, but I expect a very hard hit on an animal too. How far it penetrates will be interesting. I'm quite confident in it doing well as I'm not going to try shoulder shots.
28.5gr cfe-blk w lapua/cci lr gave me exactly 2400ft/sec ave from 527 carbine.
I may try and push it a bit harder but not sure there's much more to be gained.