Ditto what Ganderite posted. In the old days of the DCRA, the army issue 7.62 ball ammunition was all the shooters could use. It was free afterall, so tune the rifle to the ammo. The list of available rifles was short - No.4, P14/M17, M98, Carl Gustav and maybe Rem 700 or Win M70. Hardly any other actions were thought to be good enough. Besides every shooter had two or three No.4s. In the '70's when Musgraves and Sportcos came along and started winning, guys didn't feel as constrained with their No.4s.
I have one in the locker with a light single stage trigger, solid feed platform, wide laminated foreend, floating barrel, high comb butt, sandpaper buttpad, grooved trigger, inletted handstop rail, etc. Just about every part has been examined and tuned. Can it shoot 1000yds? Dunno, I have other rifles good for that.