The only .338 I've seen used at a match was one of our local club 600yd matches where the match director (me) lets braked rifles shoot alongside in the interest of getting enough people to make the match interesting.
The guy had a Sako action in .338 LM w/ a long Lilja barrel and an AR-30 'tank' brake on it - very nice, and very accurate gun. You could see the blast wave wildly flapping the lid on his ammo box every shot. Pretty sure he wouldn't want to fire that many rounds (~70) in a day without a brake. Even if it was weighted up to just under the 22# limit. Then again, recoil doesn't bother some people - me, I'm a wuss
I kind of got a chuckle out of it... the guy was obviously enjoying himself, and we have enough room relative to our turnout that I was able to put him down on one end where nobody other than his scorer (who wore plugs *and* muffs) got abused by it. What made me chuckle was that he thought that big cruise-missile bullet could plow thru the wind with indifference. Turns out it could shoot an '8' just about as easily as my wittle Savage 10FP w/ a 27" 6mm BR barrel shooting 107gr SMKs...
Sometimes you just can't buy points; occasionally you actually have to pay attention to the conditions