I have to agree with Jay. On my old Remington 1894 guns I just mount the gun between my jaw and chin. I think your brain will start to guide your face to different drop guns(your eyes get used to seeing the rib at a certain angle) after you shoot a few different guns. I think you can also get a feel for shooting different drops and mounting you face the same way but if you are shooting a lot of drop and have your face mounted low you wont be seeing your target as well. Get a gun and spent some time shooting it. Pay attention to how the rib looks on the guns that fit you(Im not saying that you should be looking at the rib/sight when you are shooting, just notice what it looks like for comparsion sake) Dont be afraid to move your head up. Good luck,
Ross
