I am positive you may rely on them, possibly with none troubles, but in a 300 wm, I'd personally personally consider to locate some Federal GM215M primers, or large rifle magnum gold medal match primers, especially if you hunt in chilly conditions. I have employed BR-two's in 7mm rem mags https://zndhtchencci55091345.blog-mall.com/32116427/how-much-you-need-to-expect-you-ll-pay-for-a-good-hodgdon-h1000