Pyrodex, and most other black powder substitutes, are formulated to be a volume-for-volume equivalent of black powder, not an equivalent mass-for-mass (weight-for-weight). Pyrodex is measured by volumetric measurement techniques, not in grains on a scale, due to the difference in density of Pyrodex versus black powder. For example, to measure a "60 grain equivalent" of Hodgdon's Pyrodex suitable for use in a muzzleloader rifle, one uses a volumetric measure that produces a volume of Pyrodex equal to the volume of a mass of 60 grains of black powder. Due to Pyrodex being less dense than black powder, a measurement by weight on a scale of 60 grains of mass of Pyrodex would be near a 30 percent overload.
Volume equivalence is a benefit in loading muzzleloading firearms, traditionally loaded using volumetric measures.
Triple Seven, unlike Pyrodex or Goex Clear Shot, is not a volumetric substitute for black powder. Triple Seven is, volume for volume, more powerful and users should follow load recommendations from the manufacturer.
Substitutes: Two of the many black powder substitutes are Pyrodex and Triple Seven. Both are available in granulated and pellet form. Use Pyrodex in volume equal to black powder; but when using Triple Seven, reduce your loads by 15%.
Measuring: Before loading a black powder product into a firearm, always measure it by volume and not by weight.
