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Within firearms, chamber pressure is the pressure exerted by a cartridge case's outside walls on the inside of a firearm's chamber when the cartridge is fired. The SI unit for chamber pressure is the megapascal (MPa), while the American SAAMI uses the pound per square inch (psi, symbol lbf/in 2) and the European CIP uses bar (1 bar is equal to 0.1 MPa).
9mm NATO can be considered an overpressure variant of 9×19mm Parabellum that is defined by NATO standards. The proof pressure is 3,150 bars (45,700 psi), corresponding to a maximum service pressure of 2,520 bars (36,500 psi) (both using CIP methodology). [27]
[4] [5] [6] The Kistler ballistic pressure measurement sensor 6215 has a maximum working pressure of 600 MPa (87,023 psi) and is mounted recessed inside the cartridge case (the face of high-pressure sensor does not contact the cartridge case) and requires that the test cartridge case have a hole drilled in it prior to testing. The test ...
Since atmospheric pressure at sea level is around 14.7 psi (101 kilopascals), this will be added to any pressure reading made in air at sea level. The converse is pound per square inch gauge (psig), indicating that the pressure is relative to atmospheric pressure. For example, a bicycle tire pumped up to 65 psig in a local atmospheric pressure ...
For example, the SAAMI maximum pressure for the 7.62×51mm is given as 52,000 psi (CUP), or 62,000 psi (430 MPa); the .45-70, on the other extreme, is listed as 28,000 in both CUP and psi (190 MPa). SAAMI standards for a given cartridge may be expressed in CUP units, LUP units, or in standard units of pressure (psi or MPa).
Speer Gold Dot 124gr 9mm+P in SIG P226 magazines. Overpressure ammunition, commonly designated as +P or +P+ (pronounced Plus-P or Plus-P-Plus), is small arms ammunition that has been loaded to produce a higher internal pressure when fired than is standard for ammunition of its caliber (see internal ballistics), but less than the pressures generated by a proof round.
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