You may see some of this changing in a few years if George at GA Precision can get Lapua to make the brass for his 6.5 SAUM 4S. It has the MV of the 6mm and the higher BC of the Berger 140gr Hybrid. Barrel life of this round is said to be good, 3,500-4,000. Right now the only down side is brass.
Before I started reloading I just blindly assumed Sierra made about the best bullets around. Once I started researching, I realized they have only a tiny share in the precision BR game.