<P> The SAAMI pressure limit for the . 38 ACP or . 38 Auto is set at 182.72 MPa (26,500 psi), piezo pressure . The SAAMI pressure limit for the . 38 Super + P is set at 251.66 MPa (36,500 psi), piezo pressure . </P> <P> The C.I.P. and SAAMI specified . 38 Super (+ P) has a semi-rimmed cartridge case . </P> <P> In recent years, cases such as the . 38 Super Comp, . 38 Super Lapua, . 38 Super RL (Armscor), and . 38 TJ (. 38 Todd Jarrett) became available transforming the . 38 Super into an almost truly rimless cartridge . These "rimless" cases are somewhat of a misnomer, due to the case rim not retaining the same diameter as the case wall just forward of the extractor groove . A common example is the . 38 Super Comp case, which has a semi-rim extending only . 003 -. 004" per side, compared to standard . 38 Super which has . 007 -. 009" per side . The main reason for the development of new cases was due to the semi-rimmed . 38 Super case not always feeding reliably from the double - stack box - magazines used in several semi-automatic pistols popular with practical shooting sports, such as USPSA or IPSC . The nearly rimless cases improve feeding reliability in these pistols but are intended to be used in firearms that headspace on the case mouth . Other improvements found in some of these cases are modified extractor grooves and increased thickness in key parts of the brass for high pressure loadings . </P> <P> Because of its larger case volume, which allows for more smokeless powder and results in higher muzzle velocities at approximately similar pressure levels, the . 38 Super offers higher bullet velocity potential than the 9 × 19mm Parabellum when handloaded and in some defense loadings . The 9 × 19mm Parabellum is however approved for higher pressure + P loadings by both SAAMI and C.I.P., which compensates for much of the case volume difference in factory - loaded ammunition . The . 38 Super is generally regarded as a well - balanced cartridge with a flat trajectory, good accuracy and relatively high muzzle energy; most loadings have greater muzzle energy than many factory - loaded . 45 ACP loadings . </P>

What is the difference between 38 super and 38 super comp
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