I have just been given a new Rhino 6 - 24 x 50 Mil Dot AO IR .... not the best of scopes I've been told but heh it was a present!!

I fitted it to my .177 AA400 and tried it out at the range @ 35 yards yesterday but even with maximum adjustment on the elevation turret it was still shooting really low. The Simmons scope I took off had no such problem.

Can anyone advise on how I might resolve this, I was told shimming up the mounts should cure it .... What do I have to do?

Any help much appreciated!!!