Steve, I like my .284 Shehane. I don’t have to run it hard for great accuracy which makes life easy for the barrel and cases. It also doesn’t beat the heck out me for 20 shot strings out of a 14 pound rifle, which means for BR, I could shoot light and heavy gun classes.
John Whidden shoots a hot .243 with heavy (115 gr.) bullets at 3000 plus that holds better in the wind than the 7’s. I’ve read that he makes the brass from the small primer .308 brass. I’m sure that he doesn’t worry about barrel life or case life; but who knows, it may be the next “hot setup”.