I shoot the 350gr and 400gr RNs in my .416 Rem R93 Luxus Safari rifle, in the California 95 degree-F sun. Yes, I shoot it rapid fire (quick follow-up shots). Look at the wood and the silver receiver with animal engravings - it's one of the more expensive rifles out there (doubles not considered). One thing for sure - it's NOT conventional; dirt/grit could get under the bolt in extreme situations.
BTW, the .416 is a bit lighter than the .375H&H; I guess it's because the bore is bigger (less metal).