Re: Balistic Software accuracy question
If you're seeing a problem between 100 and 200 yards, my first thoughts are:
1) Be sure you're entering the proper sight height. This is the distance from the scope centerline to bore centerline.
2) Make sure you confirm your 100 yard zero is actually zero and hasn't drifted.
3) Make sure you're shooting enough rounds to resolve the true center of your groups. 3 shots from a 1 MOA rifle isn't enough to resolve the true center of a group within 3/4" at 200 yards.
4) Have you confirmed (measured) that the targets are actually 100 and 200 yards away? An error of +/-10 or 15 yards can give you trouble when trying to use a program in this way.
None of the above is meant as a criticism of you, but they're the potential errors that come to mind with a mismatch over such short range. When you're only talking 200 yards, the software doesn't have much distance for normal uncertainties in atmospherics, muzzle velocity or BC to have a great effect. It's more likely a problem with your fundamental set-up.
If you share your inputs we might be able to pinpoint anything that looks 'fishy' and help you diagnose the problem.
There's no reason for a ballistics program to actually be off by 3/4" at 200 yards, but there are a number of reasons why it may seem that way.