My money is on a bit of oil between action and aluminum bedding. Seen it happen before. My guess is it shifts around and puts pressure on the guard screws. guard screws need to be floating in the pillars/ stock holes. If one is touching it starts acting like a recoil lug and accuracy goes to Crap. For some reason aluminum and steel doesn't have enough friction under recoil to hold the action from shifting but glass bedding( devcon, j/b weld ) does ??
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