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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.
Making the 9×25mm Dillon is fairly easy. Dillon Precision makes the necessary resizing die, and reliable reloading data is easily found. Most people use 115- to 125-grain bullets, but bullets with weights as low as 80 grains are used, too.
9mm Major is a wildcat cartridge of the 9mm Luger specifically for competition pistols designed to handle very high pressure. It is used in practical shooting competitions like International Practical Shooting Confederation (IPSC) and United States Practical Shooting Association (USPSA) to achieve a "Major" power factor, which earns more points for hits in specific zones on paper targets ...
Chamber Pressure Measurement by Terry Hart; Chart of SAAMI pressure levels for common cartridges, in PSI or CUP. A study Archived 2007-08-20 at the Wayback Machine done that shows a statistically significant correlation between CUP and PSI for rifle cartridges. Speer Reloading Manual Number 11, Omark Industries, 1987 [ISBN unspecified]
Components of a modern bottleneck rifle cartridge. Top-to-bottom: Copper-jacketed bullet, smokeless powder granules, rimless brass case, Boxer primer.. Handloading, or reloading, is the practice of making firearm cartridges by manually assembling the individual components (metallic/polymer case, primer, propellant and projectile), rather than purchasing mass-assembled, factory-loaded ...
The 9×23mm Winchester is a pistol cartridge developed as a joint venture by Winchester Ammunition and Colt's Manufacturing Company. [2] The 9×23mm Winchester has a convoluted development history, but was commercially introduced by Winchester in 1996.
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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).