What rifle is the 7mm-08? Mine is a Howa 1500 that I got in a trade. Haven't shot anything live with it, but my DIL used it when it was hers to kill a buck very neatly at about 80 yards. Remington factory 140 grain Core-Lokt bullet, I think.

I believe that Federal and others offer it with optional 140 grain Nosler Partition bullets. I'd happily tackle an elk with that. Many moose are taken with lesser calibers.

It's hotter than the classic 7X57mm, and that round has killed elephants! It's also a standard for deerstalking in Scotland.

It should shoot plenty flat for most pronghorn hunting, too. It won't have the range of your 7mm Magnum, but most game is killed well withn 300 yards, anyway. The 7mm-08 doesn't kick like your Magnum, and the barrels last longer.

If the rifle is a good one, I think you'll like it. But unless you handload, it's primarily a medium game round intended to be used within 400 yards or so. As such, it has an excellent reputation.