Zeroed my scope on my hw99 yesterday, scope is a 4x40 front parralax adjustable by nikko sterling, I had to use lots of upward adjustment on elevation turret to get it zeroed and when the parralax ring was moved up a gas popping noise was audible from the elevation turret, is this the nitrogen escaping? I've now wound the turret down and no noise now so I obviously used to much adjustment, would the best way be to shim my rear mount so that the scope can be zeroed without using excessive clicks?
Chris