Internal ballistic simulation calculations with black powder are unknown / nonexistent, therefore only rough estimates can be made. The black powder calculator provides the functions for estimating the muzzle velocity.

The equations for estimation are a further development of the calculation bases presented by Don Miller in the magazine „Black Powder Cartridge News“ #76 (2011, pp. 27-30). The GRT further development of the respective equations includes an adjustment of the factors on the basis of own measurements, including additional bullet variants and black powder varieties.

• Formula
  Here you select the equation to be used.

• Powder type
  Here you select the used black powder.

• Barrel length
  Enter the length of the barrel in inches here.

• Projectile weight
  Enter the bullet weight in grain here.

• Projectile type
  Select the projectile type used here. For example, it is also permissible to set a minié bullet or a round bullet for a black powder cartridge.

• Powder charge
  Enter your powder charge in grain here.

The calculation takes place automatically after changing a parameter.