Search results
Results from the WOW.Com Content Network
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.
The test cartridge must be inserted into the chamber in such a way that the hole in the test cartridge case lines up with a gas port hole that channels the gas pressure from the cartridge case to the face of the sensor. The measurement accuracy of the pressure measurements with 21st century high-pressure sensors is expected to be ≤ 2%. [7]
The .45 BPM cartridge was developed to allow for black-powder loads of more than 40 grains. This gives the converted Colt Walker the convenience of using self-contained cartridges and the advantage of loads beyond the 40 grain limitation of the .45 Colt cartridge and provides the added benefit of moving the bullet closer to the forcing cone as ...
Black powder produces gas at a predictable rate unaffected by pressure, while the gas production rate of smokeless powder increases with increasing pressure. [6] The possibility of runaway pressures caused smokeless powder to destroy many firearms designed for black powder and required much more precise measurement of propellant charges.
Most rifle cartridges have a high load density with the appropriate powders. Rifle cartridges tend to be bottlenecked, with a wide base narrowing down to a smaller diameter, to hold a light, high-velocity bullet. These cases are designed to hold a large charge of low-density powder, for an even broader pressure curve than a magnum pistol 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).
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
Bullet's Brinell hardness number (BHN) x 9.80665 N/kgf×10 6 mm²/m² = [N/m²] = pressure in pascals Bullet's BHN x 1422 = pressure in pounds per square inch [3]. The conversion factor of 1422 is mathematically derived in order to convert the pressure in kgf/mm 2 (the units used to measure BHN) to lbf/in 2 (the units used to measure cartridge pressure).