I have an axis with a weaver one piece rail. when i set up and mount the scope rings every thing seems fine. when I take the scope and rings off and place on flat table only three sides of the four touch the table. the rifle has larger than normal groups. could my rail be twisted ? had rail on other gun and had problems now that action has new rail and scope and is accurate. not sure if other scope was bad or was mounting or was twisted rail how can i check thanks in advance