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Firing shotgun shell of the correct gauge or bore, but in a chamber length that is too short (for example a 70 mm shell in 65 mm chamber) While the table below lists most unsafe combinations known by SAAMI, the list is not exhaustive of all dangerous combinations due to the large number of cartridges.
In C.I.P. regulated countries, every rifle cartridge combination has to be proofed at 125% of this maximum C.I.P. pressure to be certified for sale to consumers, referred to as "PE". This means that 4.6×30mm chambered arms in C.I.P. regulated countries are currently (2018) proof tested at 5,000 bar (500 MPa; 72,519 psi) PE piezo pressure. [ 6 ]
The .30 carbine's relatively straight case and round nose bullet have misled some to believe it was designed for use in pistols.) The .30 carbine uses a lighter bullet (110 grain versus 165 grain) and improved powder. As a result, it has approximately 41% higher muzzle velocity with 27% more impact energy than the parent .32 WSL cartridge.
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).
The .30-30 Winchester / 7.8x51mmR (officially named the .30 Winchester Center Fire or .30 WCF) cartridge was first marketed for the Winchester Model 1894 lever-action rifle in 1895. [4] The .30-30 (pronounced "thirty-thirty"), as it is most commonly known, along with the .25-35 Winchester, was offered that year as the United States' first small ...
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%.
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