Took the gun to my gunsmith yesterday and he immediately suspected the trigger. He took it apart and it had lube in it -- thick, waxy stuff that slowed everything down. He removed it, cleaned it, put it back in, and everything is perfect now. Just got back from shooting it and even after having it out of the stock it never changed zero.
I never lube my trigger. The only thing I can think of is that some Hoppes or something ran down into the trigger. But even that seems odd because I store my rifles upside down. I hang the trigger guard on wooden peg in the wall, and rest the barrel on another peg. They're at an angle with the barrel downward.
Anyway, problem solved. Thanks for all your input.
Steve.
