I use MagPro in 300 Win Mag, 300 PRC, and 338 Lapua Magnum ... all with great results. It's not as trendy as R26, or H1000 or Retumbo, but for medium to large magnum calibers, it's stable, predictable, and very consistent for me. One great benefit is that the double-base spherical powder measures very accurately in my Chargemaster 1500. I know some don't like it, but I give it "two thumbs up".