I'm absolutely sure you could utilize them, most likely without any issues, but in the three hundred wm, I'd Individually check out to uncover some Federal GM215M primers, or large rifle magnum gold medal match primers, especially if you hunt in cold problems. I have used BR-two's in 7mm rem https://z-ndh-tchen-large-pistol68262.ja-blog.com/31605839/the-best-side-of-large-rifle-magnum-zündhütchen