![]() ![]() The maximum range at which the calculation stops. If measured station pressure is available, use that. This is not the same as the barometric pressure reported by the local news, which has been corrected to the equivalent sea level pressure.Īs an alternative to entering pressure, it can be estimated based on altitude. The absolute (station) pressure at the firing site. The temperature of the air in degrees Fahrenheit. The units in which you want the results reported - Minute of Angle (MOA), milliradians (mils), feet, or inches. Strictly speaking, this is at the muzzle, but measuring the actual scope with a ruler should be close enough. The vertical distance between the centerline of the bore and the centerline of your scope. 90 degrees is a left to right wind from the shooter's perspective. The wind speed between the muzzle and the target. The range at which the bullet's path will intersect with your line of sight. You can measure this with a chronograph, or look it up in a reloading manual (feet per second). * Weights and muzzle velocities for example energy calculations were approximate for general comparison only.About the Ballistics Calculator How do I use the ballistics calculator?Įnter a BC and matching drag function, or select a bullet from the library and then enter the following variables: After the pellet leaves the barrel, wind resistance starts to slow its speed. Muzzle energy is the energy calculated right when the projectile just leaves the gun barrel at the muzzle.= 1/2*M*V 2 where M is mass and V is velocity. This is the formula for kinetic (moving) energy and is calculated as K.E. To calculate muzzle energy, or Foot-Pounds Equivalent (FPE), you need to know the mass of the item being moved and the velocity it will be moving.BUT, if you triple the velocity you get 9 times the energy due to the V being squared in the energy formula! Muzzle energy is increased if you increase mass or velocity.Muzzle control for safety is **HIGHLY** recommended. NOTE: Assumes NOT using full-auto feature. 7,600,000 foot-pounds equivalent – Naval Gun: Mark 45 Mod 4 5-inch/54-caliber lightweight gun and shell (490,000 gns, 2650 FPS).50 BMG bullet with an Accuracy International AX50 338 Lapua Magnum bullet with a McCmillan TAC-338 309 foot-pounds equivalent – 9mm bullet with a Walther PPQ M2 (115 gns, 1100 FPS).357 “pellet” and Sam Yang Recluse big bore airgun for Coyotes? (95 gns, 983 FPS) 22 RWS Superdome Pellet with an Umarex Octane (14.5 gns, 1000 FPS) 1.4 foot-pounds – Steel BB with an old school airgun (5 gns, 350 FPS).An energy of 1.0 foot-pounds equivalent (FPE) is the work to move a 1 pound mass 1 foot from its original location. One way to describe muzzle energy is the work required to move a mass over a distance.The bullet leaves the barrel at more than 4200 FPS. 22-250 Remington and 220 Swift are two of the fastest production firearm bullets. Subsonic: Under 0.8 mach, 609 mph, or 893 FPS.There are multiple descriptions for Mach measured speeds:.The speed of sound in different units (assumes “standard” air):.When a gun shoots a projectile at or above the speed of sound, there is an audible cracking sound or mini sonic boom.The speed of sound (Mach = 1) is where an object moves at the speed of sound waves. ![]() This high speed can come with a price if the projectile moves to a slower speed (below Mach 1) and the pellet starts to tumble. Some modern airguns can shoot a projectile FASTER than the speed of sound.Chuck Yeager was the first person to break the speed of sound and it was a bumpy ride getting there. ![]()
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