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While CUP and LUP numbers were intended to be comparable to the crushing power of a given pressure in psi (lbf/in 2), the numbers are not equivalent.Since a longer duration, lower pressure pulse can crush the cylinder as much as a shorter duration, higher pressure pulse, CUP and LUP pressures frequently register lower than actual peak pressures (as measured by a transducer) by up to 20%.
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).
[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 ...
Because dry-firing (releasing the firing pin with an empty chamber) a gun can sometimes lead to firing pin (striker) damage, dummy rounds termed snap caps are designed to protect centerfire guns from possible damage during "dry-fire" trigger control practices. To distinguish drill rounds and snap-caps from live rounds these are marked ...
A barrel chamber with pressure relief ports that allows gas to leak around the cartridge during extraction. Basically, the opposite of a fluted chamber, as it is intended for the cartridge to stick to the chamber wall making a slight delay of extraction. This requires a welded-on sleeve with an annular groove to contain the pressure. [8]
With high-powered cartridges, a significant amount of force is required to engrave the bullet which can raise the pressure in the chamber above the maximum design pressure. Higher-powered rifles usually have a longer freebore so that the bullet is allowed to gain some momentum, allowing the and the chamber pressure to drop slightly before the ...
[6] [7] [8] The new Casull round uses a small rifle primer rather than a pistol primer, because it develops extremely high chamber pressures of over 50,000 CUP (copper units of pressure) (410 MPa), which are rifle levels of pressure. It requires the use of a rifle primer to withstand those significantly greater pressures, blurring the ...
Though very similar in appearance to the .38-55 Winchester parent cartridge, the .375 Winchester cartridge has a shorter case length and operates at a higher chamber pressure of 52,000 CUP or 55,000 psi (380 MPa), compared to the .38-55 Winchester cartridge which has a longer case length and operates at a lower chamber pressure of 30,000 CUP or ...