.45 ACP

The .45 ACP, also known as .45 Auto, .45 Automatic, or 11.43×23mm is a rimless straight-walled handgun cartridge designed by John Moses Browning in 1904, for use in his prototype Colt semi-automatic pistol. After successful military trials, it was adopted as the standard chambering for Colt's M1911 pistol. The round was developed due to a lack of stopping power experienced in the Moro Rebellion in places like Sulu. The issued ammunition, .38 Long Colt, had proved inadequate, motivating the search for a better cartridge. This experience and the Thompson–LaGarde Tests of 1904 led the Army and the Cavalry to decide that a minimum of .45 caliber was required in a new handgun cartridge.

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1905  Wikimedia, Wikidata
.45 Auto; .45 Automatic Colt Pistol; 11.25 mm; 11.43×23mm; 45 ACP
pistol cartridge, United States, 

.38/.45 Clerke, .451 Detonics Magnum, .475 Wildey Magnum, .50 Action Express, .50 GI, 10.6×25mmR, 11.35mm Schouboe, 6.5mm Bergmann, 6.5×25mm, 7,65×25 Mannlicher, 7.65×21mm Mannlicher, 8.5mm Mars, 8mm Roth-Steyr, 9mm Mars, 9×23mm Largo, 9×25mm Dillon, Astra 3000, Astra 4000, Beretta 318, Bernardelli P8, Calico M950, Campo Giro, Coonan .357 Magnum, CZ 122 Sport, Gustloff pistol, HK P10, HK P9S, Hämmerli X-Essen, PAMAS G1, Pardini SP, pistol cartridge, Pistole vz. 24, Safari Arms Matchmaster, TOZ-35, Walther GSP, Walther TP, 

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Location: KML, Cluster Map, Maps,

1905-01-01T00:00:00Z

1905-01-01T00:00:00Z

1905 .45 ACP

1914-07-28T00:00:00Z

1914-07-28T00:00:00Z

World War I

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Frameless

22-45

Fired rimfire and centerfire casings (2)

Comparative handgun rounds

Pistol caliber cartridges comparison - 7.62x25mm, 9x18mm, 9x19mm and .45 ACP

Slidestop2

Glock 21 Avriette

45AutoJHP

U.S., Canadian Recon partner for live-fire drills 140719-M-IN448-112

Heckler&KochUSP (Bobbfwed)

Dan Wesson DW Patriot (PT E 45)

Type	Subtype	Date	Description	Notes	Source
commons	image		22-45		Commons
commons	image		Fired rimfire and centerfire casings (2)		Commons
commons	image		Comparative handgun rounds		Commons
commons	image		Pistol caliber cartridges comparison - 7.62x25mm, 9x18mm, 9x19mm and .45 ACP		Commons
commons	image		Slidestop2		Commons
commons	image		Glock 21 Avriette		Commons
commons	image		45AutoJHP		Commons
commons	image		U.S., Canadian Recon partner for live-fire drills 140719-M-IN448-112		Commons
commons	image		Heckler&KochUSP (Bobbfwed)		Commons
commons	image		Dan Wesson DW Patriot (PT E 45)		Commons