The 7mm is outshining NOT AT THE MUZZLE rather it is outshining from 600-1000 yards. That is what suprizes me.
Try using the same calculations using realistic velocities with even the 180gr matchking and the situation will change.Then use the same calculations with that 240gr matchking and the 300ultramag and 30-378 will take the lead over the 7mmwby.