The .45 ACP (Automatic Colt Pistol) to be forged in battle. In the late 19th century, the U.S. Army was trying to find a ring to change their .38 caliber cartridges. The American pressures needed other with an ext stopping power 보다 their standard issue, and Colt reply the call. The .45 ACP to be designed by smithing legend man Browning in 1904, and also it was embraced in 1910 through the U.S. Forces, who also adopted the Colt design 1911 firearm at the time as one official addition to the military arsenal, designated M1911. Below we’ll cover all of the vital points the this hugely important bullet in ourDefinitive .45 ACP Ammo Guide.

You are watching: What does acp mean in 45 acp

.45 ACP Explained

What does ACP was standing for? What go .45 ACP Mean?

.45 ACP

Automatic Colt Pistol to be the name offered to the series of cartridges draft by john Browning in ~ the start of the 19th century. There are 5 ACP cartridges, the biggest of which is the .45 caliber.

A background of the .45 ACP: Invention, original Use, Adaption

The Philippine-American battle (1899-1902) verified that there merely was not enough power behind the bullets which were fired in ~ the time. After the war was over, the U.S. Army’s Generals go shopping because that a brand-new kind of cartridge, one which would certainly be powerful enough come neutralize person targets ~ above impact, but small enough to be carried by the usual infantry and cavalry troops.

*
John Browning, dad of the .45 ACP

Browning and Colt were experimenting with assorted pistol calibers at the time, so once the U.S. Army and Cavalry inquiry Colt to send a design for a cartridge in a .45 caliber, Colt modification its .41 pistol – which to be still in that is prototype step – and also moved on to bigger and far better things v the .45 caliber. The result of this to be the .45 ACP cartridge, i m sorry Colt submitted for inspection to the armed forces in 1906.

The new round go out the compete away, and also after a series of tests and also trials it was announced as the winner. After ~ several much more modifications were made, at the behest the the U.S. Army, the brand-new and progressed “Cal. .45 automatic Pistol sphere Cartridge, version of 1911” was adopted by the military. The M1911 was developed until 1970, and only in 1986 to be the Beretta M9 (9mm) carried in to change it as the conventional U.S. Sidearm. That is one hell of a lengthy run, and also it walk to show how reliable the .45 ACP bullet is in combat.

.45 ACP Cartridge Explained

*
.45 ACP Ammunition

The .45 bullet (11X23mm) is a ring which is accurate and also deadly. It come in relatively heavy loads, as result of its size. This is an advantage to some, and a disadvantages come others. It relies on the plan use, really. The .45 ACP come in a wide range of weight and performance levels, so there is a many to job-related around. It’s no a cur and also dry type of situation. The .45 caliber was offered for years by the military, and for good reason. If it might not it is in as rapid as a 9mm bullet, it hits through a much better punch.

.45 ACP Ballistics power Overview

Here is a rapid rundown that the ballistic properties of the .45 ACP round, in assorted grain sizes and casings (source: Wikipedia).

See more: This Is How Long Does Cooked Salmon Last In Fridge ? How Long Does Cooked Salmon Last

Bullet weight / TypeVelocityEnergy
185 serial / external inspection Defense1,225 feet every second835 Joules
185 serial / Jacketed hollow Point1,050 feet every second614 Joules
200 grain / Jacketed Hollow allude +Pressurized1,080 feet every second702 Joules
230 grain / commonwealth Hydra-Shok900 feet per second561 Joules
230 serial / US army Ball complete Metal Jacket830 feet per second477 Joules

Ballistics have actually a lot greater result when you space talking about military uses. In civilian uses, most equipped confrontations occur within a distance of 5-10 yards. Within those brief ranges, the ballistics don’t do that huge of a difference. Ballistics are all about a projectile’s speed, mass, and force. When you are talking about the .45 ACP, you deserve to see the the bigger loads are naturally slower, however the cartridge is nevertheless effective since of its thin size.