I can't speak for the Prvi load, but use the Hornady 139 gn soft point bullet measured at 2580fps out of my 7x65r and shot a fair few Roe and Red deer with it. No great fuss, but they just fall over dead after a few steps. Would nt expect any difference with the Prvi. Don't think there would be much difference in the two bullets - both big standard soft points.

Don't know about black bear, but if I was a bear I don't think I would to be anywhere near you with your 7x57r!

Plenty of Prvi ammo is used over here in other calibres and it just works well. Some rifles don't like it, but that's the same with any brand of ammo.