Havent used my Prosport for a while, so had a bash today. Fired from a rested position to ensure accuracy. I got the following results. Secondary zero 21 yards, 1 dot down 15 yards, 2 dots down 10 yards. I couldnt fire at a longer range. I then checked chairgun to get some idea of the power. Nothing comes close. I thought it was zeroed at 30 yards now im not so sure. I will check out in the field at the weekend and get a chrono reading when i can. Must buy a combro. By the way i tried all combinations on Chairgun and still nothing came close. Anybody hazard a guess at the power level? I thought it was running at just over 10,even that looks doubtful.