"...41 grains of..." Two near max loads might be the issue. Not likely though.
You ever tried the thing with non-QD rings?
Don't think I'd be comparing an M1A with a Rock River AR-10 clone. Ain't the same thing. And it can still be the bedding, just a different kind. Lotta places for a AR-10 clone to move.
Grab the thing and wiggle(technical term) it to see if there's any movement between the upper and lower. Especially at the hinge. Do the same thing with the fore stock and the scope rail. Assuming said rail's screw are tight in the first place.
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