Re: please help with drop chart
Well if your muzzle velocity was really 3900 the drop would be what you're seeing, but I don't think your getting that kind of velocity. Is the range measured? EXACTLY where are your bullets hitting at 100 yards (is this range measured?).
Something's got to be wrong -- the programs aren't usually wrong by 30% at 500 yards. I just wish I knew what it was...