M1A Horizontal Stringing

[vintage hunter]

My M1A has suddenly began to string shots horizontally. I'm up to my ears in alligators at work right now so don't have time to do much diagnostics. Need some ideas to try when I have time. The rifle is a NM that was bedded and tuned by a former U.S.M.C. armourer friend in 2001 and since has always been very precise and consistant. Bedding job is getting old but still locks up tight. Has Leupold Mark 4 M1 scope in A.R.M.S. steel rings and an A.R.M.S. #18 mount. Everything seems tight as all witness marks line up still and I can't detect any movement. Missed a nice deer with it yesterday afternoon so I stot it once this am at 100 yards, P.O.I. was 10'' left of point of aim, elevation good. POI does'nt corrispond to the adjustments on the scope. To me it acts like the stock is contacting to barrel somewhere but right now I don't have the time to do a teardown to see. All thoughts and ideas appreciated, VH BTW, the ammo I'm shooting is Remington 150gr Corelokts. A neighbor gave me a 200 rd sealed case of it 5-6 years ago so it's all from the same lot.

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