JohnnyK, there are 12 ballistic curves preset in the Leica 1600 B. They stop giving drop data after 500 yards( pages 181,182,183 in the owners instruction booklet). I have tried to match a curve to three different rifles and none match up. However one is close at 500 yards. I would like to know the drop on these 12 curves at 600,650,700,750 and so on up to 800 yards. I was still hoping to maybe find a curve I could use at 500 yards to 800 yards. Hope this is as clear as mud. Thanks for any help. George