Mobuck, the USN 7.62 converted M1's as well as the US Marine and Army M14NM's would shoot commercial match ammo or good handloads better than people could hold them. People, the best of them shooting slung up in prone, hold in an area about 3/4 to 1 MOA with any type of sights. Those rifles would shoot that ammo under 2/3 MOA at 600 yards; some near 1/3 MOA at 300 yards. So does the US Army's AR10's in .308 Win they use in competition.
Do you understand what I've said?
US Navy Distinguished Marksman Badge 153
Former US Navy & Palma Rifle Team Member
NRA High Power Master & Long Range High Master
NRA Smallbore Prone Master