Ruben Nasser
New member
Hello!! I know many of you guys are good at ballistics, so I'm asking here for your help. I have an old ballistic program (Sierra 3) that gives me a wealth of data for trajectories, wind deflection, etc. Recently I started comparing the computer results with real data obtained from shooting some rifle loads at 300 plus meters, and there were some differences. Since I can get the muzzle volocity from my cronograhp, then the ballistic coefficients of the bullets must be off. How can I correct this and make more accurate predictions? How accurate are the manufacturers BC's? I read some interesting stuff about this in reloading manual, at the "how bullets fly" web page, and I'm always reading the very interesting stuff from Rick Jamison in Shooting Times, but the more I read the more humble I become!!