I've got a 6.5 Creedmoor Ruger American Predator in an Oryx and it uses MDT .308 mags, (either metal or polymer) and they're 40% off right now as part of their black Friday sale.
The MDT poly mags with the binder plate bind up with Berger and Hornady match grade ammo. Cartridges are too long.
The MDT metal mags without the binder plate will cause rounds to get caught under the feed ramp. As you feed rounds slide forward slightly and catch under the ramp.
The howa isn't designed to run with the AICS mags for longer cartridges. I had to notch my feed ramp and adjust mag feed lips to get it to feed properly and that fixed the issue, but the bs lifetime warranty is null and void as a result.
Before and after pictures below. Good luck with their customer service if you have any other issues.