I've employed BR-two's in 7mm rem mags with good results, even in cold temps. But, that was with fairly higher case fill of H1000 and Reloder 26, and honestly I prefer to use mag primers, they have not been harmful to getting steady velocities, so it takes away any fret https://donovanuwvuq.onesmablog.com/considerations-to-know-about-cci-250-72142905