Load From a Disk is the most complete ballistics program available. It calculates the powder charge for ANY rifle and estimates the resulting velocity and pressure with unbelievable accuracy. It calculates the trajectories for up to three different bullets on the same graph.
You can also determine the ballistic coefficient for any bullet from bullet shape, velocity, or trajectory or determine the optimum rifling twist to stabilize a bullet. It includes a comprehensive bullet database of nearly 2000 bullets. It works in both english and metric units.