.50 GI

Pistol cartridge .50 GI 50giand45auto.png 250px A .50 GI (left) next to a .45 ACP cartridge. United States Handgun Alex Zimmermann 2004 Guncrafter Industries 2004–present Rebated, straight .500 .526 .526 .480 .899 1.221 275 JHP 875 468 300 TMJ 700 326 185 SCHP 1200 591 230 SCHP 1000 510 23,000 psi (160 MPa) The .50 GI (12.7×23mmRB) pistol cartridge was developed by Alex Zimmermann of Guncrafter Industries. The .50 GI was introduced at the 2004 SHOT Show alongside the Guncrafter Industries Model No. 1, a variation of the M1911. The round has a rebated rim that is the same diameter as that of the .45 ACP.http://www.ammo-one.com/50GI.html 50GI Proprietary Ammo-one.com 2018-12-30http://findarticles.com/p/articles/mi_m0BTT/is_171_28/ai_n6123136 https://web.archive.org/web/20050116092818/http://www.findarticles.com/p/articles/mi_m0BTT/is_171_28/ai_n6123136 usurped January 16, 2005 Loading the .50GI Petty Charles E. 171 28 September–October 2004 American Handgunner In 2006, Guncrafter Industries introduced its 1911 Model No. 2, which sports a full-length light rail/dust cover and is chambered for the .50 GI cartridge. Both the M1 and the M2 can be fitted with Guncrafter Industries' .45 ACP conversion unit. The .45 ACP magazines hold 8 rounds.February 2025 Physically, the .50 GI round is wider than the .45 ACP and slightly longer. The M1 and M2 magazines can hold seven rounds. The Glock conversion can hold eight rounds in the standard magazine and nine with the extended base pad.February 2025 Performance The .50 GI operates at pressures comparable to the .45 ACP, around 15,000 psi (100 MPa). Felt recoil is not unlike that of the .45 ACP. The .50 GI has developed a reputation for accuracy, though this may be due to the high precision of the semi-custom and very expensive Guncrafter pistols themselves. In one test, the 300 grain (19 g) jacketed flatpoint (JFP) gave a 25-yard group of 2.56 inches, and the 300-grain Jacketed hollow point (JHP) and 275-grain JHP gave a 25-yard group of 2.3 inches.https://www.americanrifleman.org/content/guncrafter-industries-50-gi-1911-dream-guns/ Guncrafter Industries’ 50 GI 1911 Dream Guns The penetration in gelatin (but not necessarily the kinetic energy) of the .50 GI is significantly different than the .45 ACP.http://www.brassfetcher.com/index_files/Page2410.htm .50GI Brass Fetcher 2009-09-19 https://web.archive.org/web/20100923091706/http://brassfetcher.com/index_files/Page2410.htm 2010-09-23 dead http://www.firearmstactical.com/images/Wound%20Profiles/45_ACP%20230gr%20FMJ.jpg Wound Profiles 45 ACP FirearmsTactical.com 2009-09-19 https://web.archive.org/web/20100212102154/http://www.firearmstactical.com/images/Wound%20Profiles/45ACP%20230gr%20FMJ.jpg 2010-02-12 dead While it is one of the few examples of the largest legally allowed calibers in a semiauto handgun, it was purpose built to have a recoil impulse and kinetic energy substantially less than the magnum .50 caliber rounds such as the .50 Action Express (semiautomatic) or .500 S&W Magnum (revolver). Factory-loaded ammunition has a kinetic energy of around 500 ft·lb.January 2019 The cartridge is not used in law enforcement and rarely for personal defense due to limited availability of ammunition and guns chambered for the cartridge. Currently, the only commercial handguns available in this caliber are Guncrafter Industries' own Colt 1911 handgun variants and its Glock 21/Glock 20 conversion upper receiver, and Magnum Research chambers their BFR revolver in this caliber on a custom basis.http://www.50gi.com/forums/showthread.php?t=9 Bowen's .50 GI Revolver The .50GI Forums 2009-09-19 https://web.archive.org/web/20160303210348/http://www.50gi.com/forums/showthread.php?t=9 2016-03-03 dead Ballistics 185 gr (12 g) JHP, 1200 ft/s, 591 ft-lb, 222 power factor 275 gr (18 g) JHP, 900 ft/s, 495 ft-lb, 248 power factor 300 gr (19 g) JFP, 700 ft/s, 350 ft-lb, 210 power factor 300 gr (19 g) JHP, 860 ft/s, 493 ft-lb, 258 power factor See also .45 ACP .50 Action Express .500 S&W Magnum/.500 Auto Max .50 caliber handguns 12 mm caliber List of handgun cartridges List of rebated-rim cartridges References Further reading Anderson Dave Bye Bye .45 Guns 48–53 FMG Publications September 2007 External links Guncrafter Industries Category:Rebated rim cartridges 50 GI Category:Weapons and ammunition introduced in 2004