The 9mm is not quite as good as some of its fans think, but it is a better cartridge than most of its detractors would have you believe. It is also incompatible with some guns (look at the owners manual for specifics on your gun). Compare all 9mm ammunition manufacturers on one easy to read chart. I remember my FAMILY loading very hot 9mm Handloads for the surplus P-38 & P-08 pistols in the 1950's-'60's. +P or higher-pressure loadings may reach 1300 fps. American made 9mm Luger didn't always function these guns. But other rounds have even higher pressure. Click on a term to search for related topics. Standard pressure SAAMI loads are 35,000 PSI while +P pressure is 38,500. Of course you can shoot just about any 9mm Load in a RUGER BLACKHAWK .357 Convertible's 9mm cylinder. 356 TSW has a maximum limit of 50,000 psi. All this means it is a recognized "standard" for loading ammunition for 9 MM. Most +P rated 9mm pistols are rated to withstand greater than 70,000 psi before catastrophically failing. It did, and still does. Both out of 4 inch barrels. +P Is maximum 38,500 PSI. 9MM Standard Pressure, as layed out by SAAMI Specifications is 35,000 PSI. On Speer's website they list the 124gr+p at 1220fps and the 124gr standard pressure at 1150fps. Some ammunition companies list 9mm +P+ loads, which are not regulated by SAAMI and are loaded to proprietary pressure levels and velocities, so are only recommended for select guns. With that explosion comes starburst pattern fragmentation, reduced over-penetration, and 100% energy transfer. They do well against barriers, but when the cavity fills with fluid, the hydraulic pressure builds until the side walls of the projectile explode. It is a 9mm-OAL round designed to make major power factor for IPSC/USPSA right out of the box. If I we're looking for something with a little less recoil (not that 9mm has much anyway, especially in a full size gun) and with less muzzle blast, would the 124 grain standard pressure do just as well as the +p version? An overpressurized (+P) 9mm may have 38,500 psi β an increase of 10%. 9mm pressure vs 38 p, 9mm vs 38 chamber pressure, luger maximum pressure, max load pressure for 124 grine 9mm, max pressure for 9mm, maximum pressure for 9mm loads, minimum pressure for 9mm loads. 9mm NATO can be considered an overpressure variant of 9Γ19mm Parabellum that is defined by NATO standards. Let's use 9mm as an example. A higher pressure round (+P+) may be rated to something like 45,500 psi. The service pressure P max of the 9mm NATO is rated at 252 MPa (36,500 psi) where CIP rates the 9mm Luger P max somewhat lower at 235 MPa (34,100 psi). Complete 9mm ammunition ballistics Chart. The 9mm easily jolts 115 to 124-grain bullets to well over 1100 fps. A +P+ load is X percent higher than a +P load. Thatβs nearly a 30% increase from the standard. Thread Tools: Search this Thread: Show Printable Version. 9mm +P is 38,500 psi, which is close. The 9mm is a powerful number well-suited to personal defense. The 9mm +P will produce slightly better performance than a standard 9mm, at a noticeably higher cost. Again +P+ does not exceed the proof round. As noted, 357 Sig runs 40,000 psi. Some semi-auto pistols will handle the high pressure with no problems. No problems with the Canadian made Hi-Powers. This brings us to 9mm Luger +P loads that operate at a maximum average pressure of 38,500 psi, and again are not recommended for all pistols. This does not mean your gun will "blow up" if you exceed these specifications by 1 PSI. SAAMI does not publish +P+ loads and therefore they are developed by each ammunition manufacturer. β s nearly a 30 % increase from the standard at a noticeably higher cost 10 % Show. 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