Once had an A bolt in 25-06 with a boss system. Rifle was astonishingly accurate. On the chrono it was found to be a little on the slow side compared to other 25’s I have seen but it still worked like a charm on PA white tails. I traded it off in favor of a shotgun for trap shooting. The boss system shortens the barrel about 2 “ so part of the reason for being slow. But it had trouble getting to 2800 with 115 not bullets.