I just bought a Primary Arms GLX-6X24X50F with Athena reticle. While checking out the turrets I found the elevation would only spin up to 8 mils on the dial before it would stop. The manual says that it should turn 4 rotations. Do I need to set the elevation Auto Lock and Return-to-Zero downward below the factory set position (like it says in the manual)? I will be mounting this scope on my 308 RPR which has a 20 moa rail so I believe I will have to do this anyway. Any help would be appreciated.