ONLINE BALLISTICS
A suite of ballistics programs

When complete, this collection of ballistics programs will enable the estimation of all the ballistic information needed from "click" to "thump". It is intended that the programs should give the most accurate results available in the most accessible way, so ease of use has been of prime concern in designing these programs. All the programs are accessed on-line and the interface is via your browser, so there is nothing to download and there are no operating system problems. If you can read this, you can run the programs.

  • Trajectory This does what lots of external ballistics programs do. Enter a muzzle velocity and a Ballistic Coefficient and the program will plot a table of drops, wind deflections, velocities and energies for ranges from 50 yards up to 1000 yards. But this program will do a lot more besides. . .

  • Barrel twist After the dimensions of the bullet of interest are entered, the program will give you a graph of the barrel twist required to stablise the bullet as a function of muzzle velocity.

  • Drag curve to trajectory program This is the best external ballistics program you will find outside commercial offerings costing thousands of dollars. Just put the bullet dimensions in at one end and a full ballistics table of drops, wind drifts, velocities and energies for ranges from 50 yards to 1000 yards will emerge at the other end. On the way, the program calculates the G1 and G7 Ballistic Coefficients for a range of Mach numbers, as well as barrel twists required to stabilise the bullet, and a curve for Drag Coefficient against Mach number. The ultimate tool for the bullet designer.

  • Vibrations on a rifle barrel This program is unique on the Internet. It allows you to use a sophisticated finite element program to model the vibrations created in a rifle barrel by the recoil forces. This model appears to reproduce the results of other computer models for the same barrel configurations, and to be in reasonable agreement with the results of experimental studies of the vibrations of small arms rifle barrels.

I am about to start a new business venture - not making rifle barrels this time, but making chamber reamers, headspace gauges, rifling buttons and other tooling for gunsmiths. See www.bbt.scot for more details.