A 300 is still very manageable w/o a brake, that would decide it for me as I despise them. 338L is too much of a good thing.
I also have to agree with others on the 7RM, but I'm a bit biased. I run 300s and 7RMs and can't really tell that the 300 will outdo the other. Yes, it'll chunk a larger bullet, but ballistics between the two with like bullets are too close to edge the other out. That said, less recoil wins.
