Ballistic Programs Not Matching Actual Dope?

[asmo]

Sounds like your muzzle velocity and/or your BC is off in your math. It's really easy to get the velocity off.

Certain, higher end, ballistic calculators (Exbal, ATrag, etc) will let you put in your actual shot placement at various ranges and then work backwards to give you a corrected reading.

However, with a group like what you're shooting at 100 yards I would possibly start looking at your consistency first. Here is a typical 100m for me (and I still have trouble past 600m).