It's tough to get LOP perfect. Most people/fitters believe LOP the least important dimension. Also, for LOP double vs single tigger? For trap/skeet w single trigger I shoot 14 1/2" LOP. For a double trigger hunt gun measurement from forward trigger I shoot 14 3/4" LOP, but for DT you really want to be set up for back trigger and only use tip of finger for the front trigger. For Single Trigger bird gun i like 14 1/4" lop. Allso, heavy clothes make a 1/4-3/8" lop difference. You will have to figure it out on your own with trial and error.