Do you guys mark the glass in your scope? Until now, I have never thought it was a big deal but I took my glass out last night and cleaned it and just put it back in and screwed it tight. Went to shoot today and was not even close to the X!! So I guess I will put a mark on the scope now! I thought I was going nuts or something came loose until I remembered that I cleaned the glass...I was even blaming the finger sling that I was trying to get used to tonight!