Gene, As I mentioned above, the answer to providing a correct shot is not just a ballistics program but a program combined with a weather station that has sensors for station pressure, wind, coriolis effect, angle, etc. The instrument that does all this is the Kestrel 5700 weather meter with the AB ballistics program installed. It uses the ballistics program with your SPECIFIC load and muzzle velocity along with all its sensors and internal program to give you a final firing solution. True, the Kestrel 5700 can't give you downrange wind but the wind at your FFP is the most important reading. Determining hold-off for downrange wind is up to you. Eric B.