Thanks, gents. Appreciate your input.And yes, it is a springer, HW97K.What is the general theory to setting up a scope and rifle to avoid temperature variation? With the scope, I assume it is avoiding any residual stresses in the mounting.I had this theory that as temperatures creeped back to the 60s, as they did toward the end of the match, I would probably return to what my (modified the day before) card said. But the targets were so chewed up by then, I couldn't tell where I was hitting and unfortunately didn't have time to return to the sighting range to check my theory.Also, somewhat fascinating that my little observations seem to gibe almost exactly with your temperature compensation chart, Scott H.