I have a 6.8 in a Browning Xbolt Western Hunter with 24" barrel. It easily runs 2925fps with Berger 170 EOL's in the .3-.4's and will Mag feed. It is absolutely set up correctly from a SAAMI standpoint. Performance is fantastic for such a small case using these high b/c bullets. If you want similar performance out of a SAAMI 300 WSM, you have a lot of work to do. Fix the throating, extend the mag box etc. When the 300 is "fixed" or correctly set up to run high b/c bullets, it's the clear winner at that point. But SAMMI to SAAMI, the 6.8 wins imho.