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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.
LAR Reloading Data: Cartridge: "357/45 GWM" ... .38 Super (.38 Super Auto) .356 9.0.900 22.9: 1.280 ... "10 mm Magnum Data" Handloading sheet .40 Super.400 10.2.988 ...
The closest comparisons are the 380 ACP, which fires much lighter bullets slightly faster than most .38 Special loads; the 9×19mm Parabellum, which fires a somewhat lighter bullet significantly faster; and the .38 Super, which fires a comparable bullet considerably faster. All of these cartridges are usually found in semi-automatic pistols.
The .38 ACP (Automatic Colt Pistol), also known as the .38 Auto, .38 Automatic, or 9×23mmSR, is a semi-rimmed pistol cartridge that was introduced at the turn of the 20th century for the John Browning-designed Colt M1900. It was first used in Colt's Model 1897 prototype, which he did not produce.
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.
It is essentially a .45 ACP case, necked down to .357, resulting in a cartridge similar in form to the earlier 7.65×21mm Parabellum and 7.63×25mm Mauser cartridges. It was created to be a low recoil target cartridge that would function reliably with multiple bullet types, FMJ to cast lead wadcutters without the feeding problems that straight walled pistol rounds sometimes exhibit. [2]
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The critical design feature of the 9×23mm Winchester is a much-strengthened case that does away with the semi-rimmed case design of the .38 Super which sometimes caused feeding problems. In contrast to the maximum pressure of 36,500 psi for the .38 Super, the 9×23mm Winchester can operate under a higher internal pressure, 55,000 psi (measured ...