I find that remarkable.I had him pick up a hundred or so cases at the range the next time they shot. He brings the cases over with three of his shooting buddies. I ran them thru a generic Forster .308 die that I borrowed from a buddy of mine. Seated Federal primers, and nothing else. We reloaded the cases with the saved powder and maybe got fifty rounds that had about .0017" of run out. He comes in the following Monday with another four or five targets that had six inch groups.
One Captain of the US Army Reserve Team, CWO4 Billy Atkins, told me years ago they tried using fired LC M118 match cases to reload for their M14 match rifles. None of them shot nearly as accurate as new M118 ammo with those having less than .002" runout. Nor as accurate as commercial match ammo. Their case heads were slammed out of square too much against bolt faces that were not squared up.
I've never heard from any LC M118 ammo shooting groups that it shot under 1.5 MOA at 600 or 1000 yards in M14's. 10 inches was the best it would do at 600 yards from arsenal test barrels in bolt actions that were more precision than any M14 barrel.