The calculations used here were copied, via the Web Archive, from a defunct web site. Despite their simplifications, especially for drift, the results are close enough to those from JBM and QuickTarget to be useful, and the calculations are done in the browser instead of on a server.
Velocity at muzzle fps 4400 or less BC G1 ballistic coeffient .005 or more Weight of bullet gn 10 or more Sight height above bore center in Zero at path crosses sights yd Elevation bore, from horizontal deg up to +/- 60 Wind speed mph Wind angle to barrel deg 0 is downrange, 90 is direct crosswind Temperature air F Altitude above sea level ft Range of last output yd 1000 or less Interval spacing of output yd 5 or more
Range, yards Velocity, fps Rise from line of sight, inches Drift from line of sight, inches Time of flight, seconds Energy, foot pounds