At a NRA match that 308 is required 800,900 and 1000yds 15 shots each target is what's call score match. 15 shot top score would 150-15x that means 15 shot within 10 ring 20"= 150, X ring is 10" 15 shot in X ring would be 15. top score would be 450-45x for 3 target.
It's same as Bart B mention about BR very small percentage shoot those small groups same with above NRA match
http://competitions.nra.org/documents/pdf/compete/natpdf/cp540-13.pdf
Match results don't lie. You got a High Master at # 170 that shoots a score of 418-4x he can have same bad day as BR shooter. Nothing magic about 308 in LR when you look at result.
It's same as Bart B mention about BR very small percentage shoot those small groups same with above NRA match
http://competitions.nra.org/documents/pdf/compete/natpdf/cp540-13.pdf
Match results don't lie. You got a High Master at # 170 that shoots a score of 418-4x he can have same bad day as BR shooter. Nothing magic about 308 in LR when you look at result.