I got a 308 Norma Mag rifle before any Norma brass was available for it . I ran 300 H&H cases into a 308 Norma trim die then fire formed the cases . During the late 60s I purchased ten boxes of Norma brass which I still have. I have used the rifle to shoot prong horn, mule deer ,and elk. One year when I lived in Wyoning I loaded up 20 rounds, shot three rounds to check the rifle sites shot three more rounds to get a pronghorn, mule deer and elk...It was some what common back then to have military surplus 30-06s converted to the 308 Norma Mag. Back then some of the boys were having their 300 H&H rifles converted to the then new 300 Weatherby. I would not have a problem taking out the 308 N Mag or the 300 H&H for big game hunting.