I am certain you may use them, possibly without any difficulties, but within a three hundred wm, I'd personally check out to seek out some Federal GM215M primers, or large rifle magnum gold medal match primers, particularly if you hunt in cold circumstances. I've employed BR-2's in 7mm rem mags https://z-ndh-tchen-small-pistol69012.oblogation.com/30961348/what-does-hodgdon-h1000-mean