I tend to agree with a problem in the stock. The fact that it shoots better warm tells me that something is expanding with the heat and either tightening or loosening. I.E. forearm screw is slightly loose so barrel warms and tightens up the barrel channel or the screw is overtightened and the resulting warmth causes screw expansion and relieves the tension. I don't know what is in an accustock, is it an aluminum bedding? If so, aluminum expands at a different rate than steel when warmed. I would check all of your stock screws first as mentioned earlier.
BW
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