![]() The following SAAMI Pressure data was acquired and compiled from various websites. Velocity is heavily determined by the length of the AR-15’s barrel. Since the AR-15 rifle is such a highly customizable gun, there are various features you can change which impact muzzle velocity, and we’ll examine them below. SAAMI Maximum Cartridge Pressure Specifications Even within AR-15s, muzzle velocity might be very different from gun to gun. © 1993 Developed by Sam Raheb of Close Focus Research (CFR) The UK legal limit for Rifles is 12 ft/lbs and for Pistols. Microsoft Excel Spreadsheet Download © 1993 Developed by Sam Raheb of Close Focus Research (CFR)ĭownload the Microsoft Excel Spreadsheet for Calculating Barrel Pressure and Projectile Velocity in Gun Systems:Ĭalculating_Barrel_Pressure_and_Projectile_Velocity.xls Deriving the Equations for Calculating Barrel Pressure and Projectile Velocity in Gun Systems Two measurements are required, the grain weight of the projectile you're using and the velocity from your Chronograph in feet per second (FPS) Enter Projectile Weight (Grains): Enter Velocity (Feet Per second): Power Output - ft/lbs Energy Expressed in Joules. In the downloadable spreadsheet, available below, the red colored values are user entered values, and the blue colored values are the calculated results. The original derived formulas are based solely on pure mathematics and that Projectile Friction, Rotational Energy, and Heat transfer are not considered. Keep in mind that the Projectile Velocity and Barrel Pressure values shown in the table below use the modified formulas to account for Projectile Friction, Rotational Energy, and Heat transfer. As you can see, the calculated results are pretty accurate and closely reflect values you would expect. The Impact Ballistic program allows you to match your specific cartridge to any of the TRACT riflescope reticles, providing BDC (Bullet Drop Compensation). The Pressure value used for each caliber happens to be the maximum SAAMI safe chamber pressure. 50 caliber BMG using CFR's derived method. Haec calculatores take into account various factors such as bullet weight, propellant type, barrel length, and atmosphaericas providere accuratam aestimationem of muzzle velocity. Shown in the table below are a few sample calculations of both Projectile Velocity and Barrel Pressure for the 9mm. Compared to the highly curved trajectories of artillery shells in the operational area the flat trajectories of direct firing tank guns. Muzzle Velocity Calculator Simpliciorem reddere processus of calculating muzzle velocity, you can use online muzzle velocity calculators. Use the following equations to determine the values you need. The following information was derived and is provided by Close Focus Research (CFR) for those who are interested in Calculating Barrel Pressure and Projectile Velocity in Gun Systems. ![]() Calculating Barrel Pressure and Projectile Velocity in Gun Systems ![]()
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