I for one do not doubt the M-14 is accurate in semi-auto fire. I have an M-14/M-1A here that recently had the damaged barrel swapped out by no less a person than Art Luppino - which if you’re into the M-14 at all, is a name you should know.
That should be an outstanding shooting instrument. My own is an early vintage Divine Texas Springfield Armory weapon with an original TRW military match barrel.