Dear all Just after some help. After coming home after a couple of long range target practice days I have encountered seemingly, what are some big discrepancies betwen MOA calculations using Exbal and Sierra Infinity and what is actual MOA adjustment in the field. It prompted me to ask the question - is there any software that actually works out there? Basically to explain the situation, I was shooting out to 600 yards. So before I went out, I ran the load I am using through Exbal to get a rough idea of the MOA correction I need to dial to get me on target. Just to cut a long story short - every MOA figure according to Exbal was way out. For example it said at 550 yards I needed to come up 7.75 MOA. So I dial in 7.75, shoot 3 rounds and they are all way low. I ended up dialing in 9.50 to get on target. I was with a friend who uses Infinity so we run the figures through that and it says 8.0 MOA. My point is that I have been in this situation before and I have had to put rounds on paper before I can confidently go out and hunt live game. What should I be using (software wise) so I can confidently get accurate MOA adjustennt pre hunt? Does any such software exist? Thankyou for any information/guidance to help get to where I want to be.