REALLY CLOSE !! The 300 can go heavier but not lighter and the 6.8 can go heavier but not lighter also. The 300 cuts a wider hole going in and has the potential to smash/penetrate bigger bone (momentum).
I still like the 300 and have many years expierance with several 6.8's in different actions,with different bbl lengths, shooting a wide variety of bullets,at hogs,deet,and yotes.
Watching the 300 closely. Thank you for your input sir. ---- SAWMAN