9mm Major, also known as 9 Major, ammunition is loaded much hotter than typical 9mm rounds, exceeding 1,550 ft/s (470 m/s) to achieve a power factor of 165. This classification benefits competition shooters as it allows maximum magazine capacity and scoring. However, it is not readily available and dangerous to use in pistols not designed for such high pressure. Most handgun manufacturers caution against using +P and +P+ ammunition and 9mm Major loads, which generate even higher chamber pressures. In tactical situations, the added velocity may improve vest penetration, but it may hinder hollow-point projectiles' effectiveness due to over-expansion. Proper cartridge design is crucial for optimal performance.[1][better source needed]
The popularity of 9mm Major has risen due to the lower cost of 9×19mm Parabellum cases compared to .38 Super cases, as well as the versatility of using guns designed for the shorter 9mm Luger cartridge. Competitive shooters in the Open Division often handload their ammunition to customize their loads for optimal performance. However, some ammunition manufacturers like Atlanta Arms, JJR Ammo, ORM Tech and Universal Ammo produce 9mm Major rounds with competitors in mind.[2]
^"9MM Major Loads". www.natoreloading.com. Retrieved 2024-01-22.
^Miller, Brad (2020-04-23). "What's 9 Major?". American Handgunner. Retrieved 2024-01-22.
9mmMajor, also known as 9 Major, ammunition is loaded much hotter than typical 9mm rounds, exceeding 1,550 ft/s (470 m/s) to achieve a power factor of...
ammunition. SAAMI and the CIP publish cartridge data. .38 caliber 9mmMajor "YOUR 9mm To True .357 Magnum - 460 Rowland". February 2, 2024. Archived from...
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compared to $400 to $1,000 for a stock gun.[citation needed] .38 Super 9mmMajor Caleb (October 16, 2019). "What Makes A Race Gun, A Race Gun?". targetbarn...
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