.45 ACP: Difference between revisions

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The '''.45 ACP''' ([[Automatic Colt Pistol]]), also known as '''.45 Auto''', '''.45 Automatic''', '''God's caliber,''' or '''11.43×23mm'''<ref>{{Cite book |title=Handbook of Handguns |last=Strickland |first=Jeffrey |page=151 |date=2014 |publisher=LULU.COM |isbn=978-1-300973294 |location=[S.l.]|oclc=1020871429}}</ref> is a [[Rim (firearms)#Rimless|rimless]] straight-walled handgun [[Cartridge (firearms)|cartridge]] designed by [[John Moses Browning]] in 1904, for use in his prototype [[Colt's Manufacturing Company|Colt]] [[semi-automatic pistol]]. After successful military trials, it was adopted as the standard chambering for Colt's [[M1911 pistol]].<ref name="COTW14">{{cite book |last1=Barnes |first1=Fred C. |title=Cartridges of the World |date=2014 |publisher=Krause Publications |location=Iola, WI |isbn=978-1-4402-4265-6}}</ref> The round was developed due to a lack of stopping power experienced<ref>{{Cite web |last=Tong |first=David |date=2020-11-07 |title=History of the .45 ACP Cartridge |url=https://www.ammoland.com/2020/11/history-45-acp-cartridge/ |access-date=2021-06-17 |website=AmmoLand.com |language=en-US}}</ref> 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.
 
The standard-issue military .45 ACP round uses a {{convert|230|gr|g oz|abbr=on|lk=on}} round-nose bullet at approximately {{convert|830|ft/s|m/s|abbr=on}} fired from a government-issue M1911A1 pistol. It operates at a relatively low maximum [[chamber pressure]] rating of {{Cvt|21000|psi|MPa|lk=on}}, compared to {{Cvt|35000|psi|MPa|lk=on}} for both [[9×19mm Parabellum|9mm Parabellum]] and [[.40 S&W]], which due to a low [[bolt thrust]] helps extend the service lives of weapons. Since standard-pressure .45 ACP rounds are subsonic when fired from [[handgun]]s and [[submachine gun]]s, it is a useful caliber for [[silencer (firearms)|suppressed]] weapons to eliminate the [[sonic boom]].
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==Performance==
The .45 ACP is an effective combat pistol cartridge. It combines accuracy as well as stopping power for use against human targets, has relatively low muzzle blast and flash, and it produces a stout, but manageablemoderate [[recoil]] in handguns (made worse in compact models).
The .45 ACP is generally considered to have greater stopping power than the 9mm.{{citation needed|date=July 2023}} Due to its larger size and slower velocity it creates a larger wound channel and transfers more energy to the target.