I have employed BR-2's in 7mm rem mags with achievement, even in cold temps. But, that was with really large circumstance fill of H1000 and Reloder 26, and Actually I prefer to use mag primers, they've not been harmful to receiving consistent velocities, so it will take away any worry https://donovansvczh.arwebo.com/54380976/detailed-notes-on-large-rifle-magnum