So here's the deal. If you haven't been practicing you may not want to be so quick to change those sites. If everything is tight it probably hasn't moved. What is more likely to happen where we go for long periods without some serious practice is WE CHANGE. That's right, if you're shooting some sort of contact rest(prongy or something like it) and you just change the grip pressure ever so slightly, 4 inches is a very likely results. YOu should really break up the practice into a couple sessions separated by a few hours and THEN see if you still hit right of right. Unless you have a very precise grip pressure, strange things can happen when we've been away from it all. Tomorrow you may very well shoot 4 inches to the left.[&:]