After having to re-zero my scope several times during the very rainy fall and winter hunting seasons I decided to take time to check more deeply into the problem. I removed the mount from the scope and was surprised to find corrosion around the three screws that connect the mount to the scope. It looked like an old car battery! Took a wire brush, knife blade, WD40 and a lot of elbow grease to clean it up. Put it back together using blue loctite and will go to the range today. Could the fact that the threaded inserts in the scope seem to be brass and the screws are metal be causing some chemical reaction? I would appreciate any and all input on this. I'll send an email to Pulsar today and see what they say.