What cartridges are these rifles chambered for? Unless they are chambered for something that is firing a large, heavy, low bc bullet at less than about 2300 fps the multi leafs are pointless. If these are to go on something like a .308, 30-06, .338wm, etc... sight in a single leaf to be zero at 200 and that will put you only about 3" low somewhere around 250 yards. Aim at the top of the back at 300. Keep it simple.