What 10 years?
Check for availability of lake city match, post 1970.
By 1965 the National Matches were dominated by the new M14 rifle and 7.62 NM cartridge. Production of the Cal. .30 National Match ammunition at Lake City was greatly reduced and the last lot of M72 NM officially designated for the National Matches was made and issued in 1966. Sufficient stocks remained for both the 1967 and 1968 National Matches. Production of M72 MATCH continued on a limited basis to fill the few requests for that caliber and to provide cartridges for practice (LC 67 MATCH and LC 68 MATCH).
M72 is 30-06. I'm familiar with the literature you're citing, and I believe you're confusing the discontinuation of 30-06 ammunition with the production dates of the 308 stuff.
I've shot many cans of LC Match/NM in 308 from the late seventies and early eighties. In the eighties the QC got better with the M852 version.
