Wellll--- "Puff" (7.62/308) could Theoretically do about 6k a minute, but it would probably jamb on You. So You tone it down to about 4k a min., and it would work, usually. but You still had to change barrels, Periodically. My Hunting Rifle , That I care about, I usually give them 5 min. to cool down between shots, this is to get the best I can develop a load for. But--- When You are Shooting @ The Trophy of a LifeTime, I don't think that barrel heat up - comes to Mind. In fact, I think that barrel heat up would be what You would be doing, With Control!