These are simple calculations done with generalities in mind. They are useful, and I have found them to be quite accurate. The problem is they are general. Wonderful for getting on paper at longer distances, but certainly needing some fine-tuning to get it exact. These programs are accurate to about 3 M.O.A. to about 700 meters.
Live fire is a necessity, however.
When Lou's cards arrived, I noticed the professional look they had. They were personalized for my cartridge of choice, had my name on them and a brief overview of their intended use. The cards come in a set of three. Each reflects different temperature conditions in order to have more accurate data. This data can be cross-referenced for different altitudes to compensate for that eventuality as well.