Unexpected zeroing problem

[Portzy]

I just wondered, is it possible to confuse the 1st and 2nd pbr's? Thats to say you are looking for the second but somehow you are mistakenly adjusting towards the first.

The ingredients are; a 4.5 x14 50mm Hawke scope sat atop a .22 BSA Lightning using JSB Express over 25 yards, the scope has been neither optically or mechanically centred prior, (maybe i should have?). This evening, while zeroing, I ran out of elevation while the POI was still some 2" or so below centre so this set me to thinking that the pellet was still on the rise.

Is this possible or is the scope a duffer maybe.

Thank you.

[tinbum]

Shim the back of the scope.

[angrybear]

To be out that far either duff mounts or duff scope.

Unless the barrel's pointing down.

[secretagentmole]

Bad scope rails?
It is a BSA Lightning.....

[adiepie]

1) reverse the mounts (front to back)

2) Invert the mounts (left to right)

3) reverse again

How much does the POI shift?

Also, a gentle thwack on the scope (use the heel of your shoe) between adjustments sometimes shifts a sticking erector mechanism?

Adrian

[series2a]

Had same problem it was a non matched set of mounts, try a set you know that were a real pair and try again.