From what I have learned, Ed is right on. an average mature buck will have 15" beams, 13" inside spread, average mass of 11" per side, eye guards 3", ears about 6 1/2", g2's 5", g3's 4". This gives you approximately a 90" buck gross. I think the problems come into the mass and main beam length which makes it so hard when glassing from long distances to determine if you are looking at a 95 -100 buck.......Just my thoughts......Allen