A lot of us use ballistic programs to assist us with our long range shooting. I was at the range on Sunday and ran into a shooter who was having fits with his ballistic program trying to match is actual data from 100 to 200 yards. I brought out my PC and opened my RSI program and was getting basically the same results he was getting. He was shooting a 30-06 and had two chronographs set up. One for the muzzle velocity, the other of 100 yards. We measured any and everything and our results were pretty close on our programs, which weren’t close to his actual range data. Then I discovered the problem and had to do some reverse engineering to get the computer data to agree with his actual data. It all came down to the scope height, which we measured a couple of times to make sure it was correct. In a perfect world the scope is parallel or almost parallel to the centerline in the bore. Using the actual scope height our ballistic program data would have been close to his actual data. But he was using 20-degree angled mounts to gain more elevation. This setup really threw the results off on the ballistic program. Once we tweaked the program and really lowered the actual scope height on the program (I think we put in .70") the program matched his actual data. Anyone else ever experience this with there b-programs matching there range data using angled mounts. I don’t have angled mounts on my rifle so I've never really run into this one. Damn I love working out a puzzle! Just food for thought.