Downloads

This page provides some of the downloads from the old website.

The BASIC programs were given to me by the late Robert L. McCoy and posted here with his knowledge. He worked at the US Army's Ballistics Research Lab for many years, where he wrote these programs as part of his work. I have made some changes to these programs (with Bob's knowledge) only as necessary to fix bugs. There are also some tabulated drag functions some of which Bob sent me and others from the Winchester text (see citation below).

• Drag Functions
  Tabulated values of the G1, G5, G6, and GL drag (G) functions, taken from Exterior Ballistics of Small Arms Projectiles , E. D. Lowry, Research Dept., Winchester-Western Division, Olin Mathieson Chemical Corporation, May 4, 1965.

• More Drag Functions
  Tabulated values of CD vs. Mach Number for the G1, G2, G5, G6, G7, G8, GI, and RA4 (G) functions (e.g. CD of the standard G1 bullet, etc). Additionally, I have a list of CD vs. Mach Number for a 9/16" sphere. I obtained the G functions and sphere from BRL. Note that the mach numbers are not the same for all the tables. The first column is the mach number, the second column is the drag coefficient. I don't remember where I got the RA4 function.

• IntLift
  A modified (modified by R. L. McCoy) version of M. A. Morris' RARDLIFT code with corrections for small arms bullets and medium caliber cannon projectiles. Provides interim estimates of lift, overturning moment and yaw drag coefficients. Inputs are very similar to McDrag (above) but it does require the center of gravity location.

• IntLift2
  A modified version of INTLIFT.BAS that has some bug fixes. The original version was written to run on a Tandy1000. There were a few problems with floating point comparisons, etc. I believe that this version fixes those bugs.

• McDrag
  Calculates bullet CD versus mach number based on bullet dimensions. For more information on this particular program see "McDrag" - A Computer Program for Estimating the Drag Coefficients of Projectiles, Robert L. McCoy, Technical Report ARBRL-TR-02293, February 1981, [ADA098110].

• McGyro
  Stability program. Calculates required twist and bullet stability. This is not Greenhill's formula.

• McTraj
  Trajectory calculation program using a second order Huene predictor corrector method, and a table of CD vs. Mach number to calculate point mass trajectories.

• Modern Exterior Ballistics, Robert L. McCoy
  The last updated unofficial errata of Bob McCoy's book. This was provided to me by the late Don Miller.

• Bullet Lengths
  The last updated copy of the bullet length list. This was a public effort, so I will host this copy but will no longer be making updates to it.