Wiktionary
n. The kinetic energy of a projectile at the point of emergence from the muzzle of a gun
Wikipedia
Muzzle energy is the kinetic energy of a bullet as it is expelled from the muzzle of a firearm. It is often used as a rough indication of the destructive potential of a given firearm or load. The heavier the bullet and especially the faster it moves, the higher its muzzle energy and the more damage it will do.
The general formula for the kinetic energy is
$$E_k = \begin{matrix} \frac{1}{2} \end{matrix} mv^2$$
where
A subsonic variant of ammunition that would otherwise be supersonic has its velocity limited to less than the speed of sound, i.e. v is fixed at around . For ammunition with this limitation the muzzle energy is variable only with respect to the bullet mass m.
Usage examples of "muzzle energy".
A gun writer suggested that it was the perfect defensive cartridge, producing twice the muzzle energy of typical nine-millimeter and.
A gun writer suggested that it was the perfect defensive cartridge, producing twice the muzzle energy of typical nine-millimeter and .
Which would give him a couple hundred extra foot-pounds of muzzle energy, and maybe a hundred miles an hour extra velocity.
This weapon will throw a 230-grain slug at a thousand feet per second to generate over four hundred pounds of muzzle energy.
The great mass of the robot lurched and shuddered as twenty bullets, each with a muzzle energy of three thousand foot pounds, tore through its body within a space of two seconds.
The big, chemical-propelled round had excellent penetration and muzzle energy, and in the hands of an expert, it was deadly out to nearly two kilometers with the Intervalle 50x variable hologram scope mounted on it.
The bullet weighed 750 grains, and was punted out with 170 or so grains of powder, which gave it a muzzle velocity of 755 meters per second, and an incredible muzzle energy of 10,240-foot pounds, although ME is a rather precarious measurement to base real-world impact on.