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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.
The greater the gas volume, or the pressure that gas is at, the more force the compensator or muzzle brake creates. Competitors could "feed" a compensator more gases than comparable .38 Super loads. However, the muzzle blast also increased significantly, and the resulting recoil re-direction could be excessive with reports of some loads causing ...
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]
The 9×19mm Parabellum (also known as 9mm Luger, 9mm NATO or simply 9mm) is a rimless, centerfire, tapered firearms cartridge. Originally designed by Austrian firearm designer Georg Luger in 1901, [ 6 ] it is widely considered the most popular handgun and submachine gun cartridge due to its low cost, adequate stopping power and extensive ...
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Using this cartridge at full power in a handgun built around the standard .38 Super +P pressure limits and lower may result in a drastically increased level of wear on the firearm or even serious damage to it due to insufficient tensile strength and hardening of the frame, slide and various small parts. This is not a significant design problem ...
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