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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.
However, the longer and more powerful .357 Magnum cartridge will usually not chamber and fire in weapons rated specifically for .38 Special (e.g., all versions of the Smith & Wesson Model 10), which are not designed for the greatly increased pressure of the magnum rounds. Both .38 Special and .357 Magnum will chamber in Colt New Army revolvers ...
P: Momentum, in pound (force) (lbf) times seconds. [1] A guide to the recoil from the cartridge, and an indicator of bullet penetration potential. The .30-06 Springfield (at 2.064 lbf-s) is considered the upper limit for tolerable recoil for inexperienced rifle shooters.
The .357 Smith & Wesson Magnum, .357 S&W Magnum, .357 Magnum, or 9×33mmR (as it is known in unofficial metric designation) is a smokeless powder cartridge with a 0.357 in (9.07 mm) bullet diameter. It was created by Elmer Keith , Phillip B. Sharpe, [ 2 ] and Douglas B. Wesson [ 2 ] [ 3 ] of firearm manufacturers Smith & Wesson and Winchester .
The .38 Super, also known as .38 Super Auto, .38 Super Automatic, .38 Super Automatic +P (High Pressure Variant), .38 Super +P (High Pressure Variant), or 9×23mmSR, [2] is a pistol cartridge that fires a 0.356-inch-diameter (9.04 mm) bullet. It was introduced in the late 1920s as a higher pressure loading of the .38 ACP, also known as .38 Auto.
In 2001 an aluminium-scandium alloy framed version was introduced in .357 Magnum designated as the Model 340. This revolver weighs 10.9 ounces. [2] The model M&P 342 was introduced in 2001 as a special run of revolvers that are identical to a Model 340 but chambered only for .38 Special +P due to some police departments ammunition restrictions. [2]
A magnum cartridge is a firearm cartridge with a larger case size than, or derived from, a similar cartridge of the same projectile caliber and case shoulder shape. [ clarification needed ] The term derives from the .357 Magnum , the original revolver cartridge with this designation.
The Smith & Wesson Model 586, is a six- or seven-shot double-action revolver chambered for the .357 Magnum cartridge; it will also chamber and fire .38 Special cartridges. The Model 586 has a carbon steel construction and is available in a blued or nickel finish; it is essentially the same firearm as the Model 686, which has stainless steel construction.