I shoot a 300 win mag and its way more than I really need. I just love hitting them like a freight train. I cannot imagine, however, using a 300 RUM or a 308 Warbird. Don't get me wrong, that's a neat cartridge because of how flat it is but that's just got to be punishing to shoot. On recoil, noise, and the wallet. I know that brass is expensive. You'd probly need a 30 inch barrel to burn all the powder that case holds. Keep looking into it if its something you're interested in though. Hope I wasnt too negative.