The .45 lengthy Colt (LC) and the .45 automatic Colt Pistol (ACP) are not nearly as comparable as castle sound. Putting .45 LC in a firearm designated for .45 ACP isn’t walking to work-related out for you.

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That’s due to the fact that one walk in a revolver and the other in a semi-automatic pistol. This will dive right into a few of the key differences between the two: .45 LC vs. .45 ACP.

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.45 long Colt Ammo

Despite Colt gift in the surname of both LC and also ACP, they are fairly different.

Way earlier in 1872, Colt and the Union Metallic Cartridge company decided to partner up and also create the .45 lengthy Colt, occasionally written together .45 LC, adopted by the U.S. Army in the adhering to year.

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The military shot the .45 LC v their Colt solitary Action military Revolver till they decided they want semi-auto pistols, in which case they essential a new firearm and also a new round.

.45 ACP Ammo

Several .45 ACP variants: hole point, complete metal jacket, WWII-era military problem birdshot/Photo Credit: Derek280/Wikimedia Commons

That’s when .45 ACP, also commonly referred to as .45 Auto, came about. In 1904, man Browning developed the .45 ACP, not Colt choose the name has tendency to imply. Return Browning did occupational for Colt in ~ the time.

The U.S. Army Transitions indigenous .45 LC to .45 Auto

Because the army wanted a semi-auto without offering up the power and also accuracy they had actually with their revolvers, lock went through what the Tompson-LaGarde tests called them was the many effective, the .45 caliber. So, the army decided to keep the .45 — ACP for a semi-auto pistol, shot v Browning’s 1911.

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.45 LC vs. .45 ACP

What rather is various besides manufacturers that the time? Well, visually, they likewise look different. The .45 long Colt looks longer than the ACP. And the LC has a .452" diameter bullet over the .451" diameter of the ACP bullet.

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There are some other, less exciting details, and also I could lose few of our newer shooters here, but the grain, muzzle velocity, and muzzle energy are various too.

.45 long Colt Specs

250-grain bullet860 fps muzzle velocity411 ft/lbs muzzle energy

.45 ACP Specs

230-grain bullet850 fps muzzle velocity369 ft/lbs muzzle energy

Which is an ext powerful, .45 long Colt or .45 ACP?

So, what carry out all those numbers interpret into? Basically, it way Long Colt is an ext powerful 보다 ACP. Which presents a new question, why go to a .45 ACP once you get more power shoot .45 LC?The answer was that it’s easier and also quicker to reload a semi-auto as soon as you’re rushed than it is a revolver. This is why, even today, the semi-auto is usually favored end the revolver.

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Often laugh at, however a reason nonetheless is the extr round capacity. You obtain a fill of 7 in 1911 magazines end the 6 shots in revolvers. 

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What space the different Names because that .45 ACP?

At first, hearing around .45 ACP, it’s straightforward to think making use of the hatchet .45 auto is simply a shortening of saying the whole thing. But, that’s not totally true. It could be why friend or your gun buddies to speak it that way, yet there’s an actual reason various other than the simplicity, and that has to do through something well-known as SAAMI.

Sig Sauer .45 ACP V-Crown Performance


SAMMI means Sporting Arms and Ammunition Manufacturers’ Institute. Lock standardize the shooting industry. And also since they’re in the company of standardizing, you can imagine the they probably have multiple rules. One of those rule is that they don’t expropriate trademarked cartridge names. But, that doesn’t mean they won’t expropriate an similar product v a non-trademarked name.

For instance, and how us get back into ACP, SAAMI wouldn’t expropriate the Copywrite, .45 ACP, however they would take into consideration a .45 automatic or .45 auto since there’s no Copywrite attached to it.

International .45 ACP Names

There are countless different names for .45 ACP, the most typical in the U.S. Is .45 ACP, .45 auto, or .45 automatic. However, you’ll find 11.43×23 mm, 11 mm 43, and also 11.25mm if you endeavor outside that the states.

Can you Shoot .45 ACP and .45 LC v the same Firearm?

The most necessary thing you should take far from this write-up is the .45 long Colt and .45 ACP are NOT interchangeable. LC is expected for your revolver, and ACP is to plan for your semi-auto. It’s never a great idea to shot and shoot ammunition with a weapon the it no designed to fire. relying on the caliber, you can severely damages your pistol or yourself. Because that instance, trying to shoot a .44 magnum v your .45 colt might blow her gun up.

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Please save in mind, also if a cartridge fits, that doesn’t median you should load it.