bsa, usually, I agree with what you have to say, but this time I must disagree.. The hardest kickers I have had lately have been .338's especially when loaded to the top with 200 grain bullets.. I could better the speed with less recoil from my .300 win. As I said, if I need more bullet than available in .30ca. I would move up to my .375...
It was always easier for me to get top speed and acc. out of my .30 cal than it was with the .338..