Question re zero

[air-tech]

What makes you think the mounts are true? have you turned one of the mounts around (only one of them) an then locked them up on the dovetail (next to each other)(without a scope in ) to see if they match up.

I doubt 1% of guns shoot precisely to where the scope rails are aiming anyway, and whether 1% of scopes themselves actually aim straight with all adjustments at their middle position. That's why they adjust, and why the adjustment available, relatively, is considerable, so even if the mounts were skewed (highly unlikely given how they are manufactured) one would simply adjust to compensate as one adjusts to compensate for everything else.

It really is very likely to be a canting issue. Although zeroing windage makes the barrel and scope line parallel, zeroing elevation does not, it introduces an angle between the barrel and scope line. This so the gun shoots upwards (in relation to the scope line) to compensate for drop due to gravity. So if the gun is held canted, this angle sends the pellet sideways. You can zero to eliminate this sideways, but this will only work at a set distance, the zeroed-for distance. Closer or more distant, the pellet will land to one side or the other, as the angle will come into play.