Submitted by admin on February 13, 2012 - 7:23pm
Calculating Barrel Pressure and Projectile Velocity in Gun Systems
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. Use the following equations to determine the values you need.
Example Calculations
Shown in the table below are a few sample calculations of both Projectile Velocity and Barrel Pressure for the 9mm, .357 magnum, .44 magnum, .45 ACP, .223 / 5.56 NATO, .308 / 7.62 NATO, and .50 caliber BMG using CFR's derived method. The Pressure value used for each caliber happens to be the maximum SAAMI safe chamber pressure. As you can see, the calculated results are pretty accurate and closely reflect values you would expect.
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. The original derived formulas are based solely on pure mathematics and that Projectile Friction, Rotational Energy, and Heat transfer are not considered.
In the downloadable spreadsheet, available below, the red colored values are user entered values, and the blue colored values are the calculated results.
Microsoft Excel Spreadsheet Download © 1993 Developed by Sam Raheb of Close Focus Research (CFR)
Download the Microsoft Excel Spreadsheet for Calculating Barrel Pressure and Projectile Velocity in Gun Systems: Calculating_Barrel_Pressure_and_Projectile_Velocity.xls
Deriving the Equations for Calculating Barrel Pressure and Projectile Velocity in Gun Systems
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© 1993 Developed by Sam Raheb of Close Focus Research (CFR)
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SAAMI Maximum Cartridge Pressure Specifications
The following SAAMI Pressure data was acquired and compiled from various websites.
Rifle | PSI |
.22 Long Rifle (rimfire) | 24,000 |
.22 Short (rimfire) | 21,000 |
.22 WRF | 19,000 |
.22 WRM | 24,000 |
.222 Remington | 50,000 |
.22-250 Remington | 65,000 |
.223 Remington | 55,000 |
.223 WSSM | 65,000 |
.243 Winchester | 60,000 |
.25-06 Remington | 63,000 |
.257 Roberts | 54,000 |
.257 Roberts +P | 58,000 |
.260 Remington | 60,000 |
.264 Winchester Magnum | 64,000 |
.270 Winchester | 65,000 |
.270 WSM | 65,000 |
.280 Remington | 60,000 |
.284 Winchester | 56,000 |
.30 Carbine | 40,000 |
.300 Remington Short Ultra Magnum | 65,000 |
.300 Remington Ultra Magnum | 65,000 |
.300 Savage | 47,000 |
.300 Weatherby Magnum | 65,000 |
.300 Winchester Magnum | 64,000 |
.300 WSM | 65,000 |
.30-06 Springfield | 60,000 |
.303 British | 49,000 |
.30-30 Winchester | 42,000 |
.30-30 Winchester (Saboted) | 38,000 |
.308 Winchester | 62,000 |
.308 Winchester (Saboted) | 52,000 |
.32 Winchester Special | 42,000 |
.338 Remington Ultra Magnum | 65,000 |
.338 Winchester Magnum | 64,000 |
.35 Remington | 33,500 |
.375 H&H | 62,000 |
.375 Remington Ultra Magnum | 65,000 |
.416 Remington Magnum | 65,000 |
.444 Marlin | 42,000 |
.45-70 Government | 28,000 |
.50 BMG | 55,000 |
5.56 x 45 mm NATO | 55,000 |
5mm RFM | 37,000 |
6mm Remington | 65,000 |
6.5 x 55mm Swede | 45,000 |
7mm Mauser | 51,000 |
7mm Remington Magnum | 61,000 |
7mm Remington Ultra Magnum | 65,000 |
7mm STW | 65,000 |
7mm Weatherby Magnum | 65,000 |
7mm WSM | 65,000 |
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Rifle | PSI |
7mm-08 Remington | 61,000 |
7.62 x 39 mm (M43) | 45,000 |
7.62 x 51 mm NATO | 60,000 |
7-30 Waters | 45,000 |
8mm Mauser | 35,000 |
8mm Remington Magnum | 65,000 |
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Handgun | PSI |
.22 Long Rifle (rimfire) | 24,000 |
.22 Short (rimfire) | 21,000 |
.22 WRF | 19,000 |
.22 WRM | 24,000 |
.25 ACP | 25,000 |
.32 ACP | 20,500 |
.32 S&W Long | 15,000 |
.357 Magnum | 35,000 |
.357 Maximum | 40,000 |
.357 Sig | 40,000 |
.38 Auto | 26,500 |
.38 S&W | 14,500 |
.38 Special | 17,000 |
.38 Special +P | 18,500 |
.38 Super +P | 36,500 |
.38 Super Auto +P | 36,500 |
.380 ACP | 21,500 |
.40 S&W | 35,000 |
.41 AE | 35,000 |
.41 Magnum | 36,000 |
.44 Magnum | 36,000 |
.44 Special | 15,500 |
.45 ACP | 21,000 |
.45 ACP +P | 23,000 |
.45 Long Colt | 14,000 |
.45 Winchester Magnum | 40,000 |
.454 Casull | 65,000 |
.480 Ruger | 48,000 |
.50 AE | 36,000 |
10mm Auto | 37,500 |
9mm Luger | 35,000 |
9mm Luger +P | 38,500 |
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Shotgun | PSI |
.410 Bore 2 1/2" | 12,500 |
.410 Bore 3" | 13,500 |
10 gauge | 11,000 |
12 gauge (all but 3 1/2" Magnum) | 11,500 |
12 gauge 3 1/2" Magnum | 14,000 |
16 gauge | 11,500 |
20 gauge | 12,000 |
28 gauge | 12,500 |
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