Ballistic Coefficient from Trajectory

This will allow the shooter to determine the BC for any bullet by measuring the bullet height at two ranges. The range data must be obtained by firing at two ranges, with the second range twice the first. This could be at 25 and 50 yards, 50 and 100 yards, or 100 and 200 yards. It is suggested the ranges be kept short to minimize grouping errors. The successful application of this method calls for both an accurate rifle and good marksmanship.

Ballistic Coefficient from Velocity

This will allow the shooter to determine the BC for any bullet by measuring the velocity at two ranges using two chronographs. Alternately, the same chronograph can be used at two ranges for the same load. This method was used by the author to determine the ballistic coefficients of cast bullets.

Ballistic Coefficient from Bullet Shape

The program uses data from the Coxe-Beugless chart to estimate a bullet ogive. Then it calculates a shape factor and ballistic coefficient for a given bullet. This method requires a minimum of input from the user, and works well with standard shape bullets. Before the advent of the modern chronograph, many commercial bullet companies used this method to determine the ballistic coefficient of their bullet line. Still a great way to estimate ballistic coefficients with a minimum of instrumentation.

Muzzle Velocity from Trajectory

This will allow the shooter to determine the muzzle velocity for any bullet by measuring the bullet height at two ranges. The range data must be obtained by firing at two ranges, with the second range twice the first. This could be at 25 and 50 yards, 50 and 100 yards, or 100 and 200 yards. It is suggested the ranges be kept short to minimize grouping errors. The successful application of this method calls for both an accurate rifle and good marksmanship.