I have a Remington 700 with a 20 moa Nightforce base. I recently replaced my Nightforce NXS with a Kahles 6-24x56. Problem is i mounted the Kahles and it will not adjust down enough to POI AT 100 YDS. Adjusted all the way down POI to the scope is at roughly 500 yds. I'm using Vortex medium 34mm ring with the Kahles. Do I need a 0 MOA base?