A look in ~ two similar names the you"ll often uncover on the next of 45 caliber ammo boxes and even firearms. Is over there anything friend should know when compare ammo significant 45 Auto matches boxes of comparable rounds significant 45 ACP?

It’s a usual question among our customers as soon as looking in ~ ammo for your 1911 or Glock 21 – do they have to be wary of 45 ACP vs. 45 Auto and vice-versa?

What’s the Difference between 45 Auto and 45 ACP?

There is no difference in between 45 Auto and also 45 ACP. They room in truth one and the same, i m sorry leads us to the point of this article: some cartridges have more than one name. Some have actually many, in fact, to the point where one inexperienced shooter might wonder if they space ordering the correct ammunition.

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History that the 45 ACP vs. 45 Auto Cartridge


The cartridge called .45 ACP (or .45 Auto) to be designed by the an excellent John Browning in 1904. The gunsmith developed the round because that a new .45 caliber semi-automatic pistol that he was also designing for Colt. While Mr. Browning design a an excellent many firearms for his very own company, he was not ungracious toward Colt whom he worked for together well. He as such didn’t object once his customer decided to name their new round the .45 Colt automatically Pistol, or .45 ACP for short.

Shooters knew the round specifically as .45 ACP for part time. However something exciting happened 1926 with the starting of the Sporting Arms and also Ammunition Manufacturers’ institute (SAAMI). The association of American firearm, ammo, and also component manufacturers exists to standardize the shoot industry. Their work-related is helpful: If you were in charge of Hornady, girlfriend would count on SAAMI specs to make sure you’re transforming out the same sized assets as federal Premium.

SAAMI procedures In

Other Names for 45 ACP

So currently we have a cartridge through two various names. To make matters an ext complicated, the .45 ACP/.45 Auto is additionally known in Europe by its metric surname 11.43×23 mm, in France especially as the 11 mm 43, and in Argentina together the 11.25 mm. It’s likewise simply dubbed the 45 by shooters who describe it a lot.

So, not just is 45 ACP vs. 45 Auto the same exact cartridge, it’s also the exact same as 11.43x23mm or 11mm 43, or 11.25mm.

But Wait, There’s More!


The .45 ACP is not the just round with multiple names. Take the 9x19mm Parabellum as an additional example. Georg Luger designed it in 1901 together the companion cartridge for his employer’s Pistole Parabellum. So, its name is basically a metric measurement add to a trademarked name. SAAMI wouldn’t have that. So, they renamed it to 9mm Luger for your purposes. At the end of the work they’re still the exact same cartridge.

When to buy ammunition, that is important to identify whether or no two in different ways named cartridges are identical. .38 Special and .38 super both sound comparable with optimistic words in your titles, but they space in fact nothing to execute with one another. The .223 Remington and 5.56×45 NATO share similar dimensions, yet the latter creates a significantly higher chamber pressure. The .300 Winchester Magnum and also the .300 Weatherby Magnum haven’t even got the same parent casing.

If you are ever before in doubt, a small time on Google will collection matters right quickly. Because that future referral you may additionally consult this table with few of the most well-known cartridges in America attach by their other typical names.

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Common NameOther name(s)
.17 HMR.17 Hornady Magnum Rimfire
.22 lengthy Rifle.22 LR, 22
.22 Magnum.22 WMR, .22 Magnum, .22 WMRF, .22 MRF, or .22 Mag
.22 TCM.22 Tuason Craig Micromagnum, 22TCM
.222 Remingtontriple deuce, triple two
.223 Remington.223 Rem
.223 WSSM.223 Winchester Super quick Magnum
.30-06 Springfield.30-06, .30 Gov"t "06
.30-30 Winchester.30 Winchester facility Fire
.300 AAC Blackout300 BLK, 300 AAC Blackout, 7.62x35mm
.300 RUM.300 Remington Ultra Magnum, .300 Ultra Mag
.300 win Mag.300 Winchester Magnum, 300WM
.300 WSM.300 Winchester brief Magnum
.308 Winchester.308 Win
.32 ACP.32 Automatic
.32 S&W.32_
.357 Magnum.357 S&W Magnum
.357 SIG357 Sig, 9x22mm
.38 Special.38 blacksmith & Wesson unique , .38 Spl, .38 Spc
.38 Super.38 supervisor Auto
.40 S&W.40 cal
.44 Magnum.44 Remington Magnum, .44 Mag
.44 Special.44 S&W Special
.45 ACP.45 Auto, 45
.45 Colt.45 long Colt, .45 LC
.45 GAP.45 Glock
.45-70 Government.45-70, .45-70 Govt.
.50 activity Express.50 AE
.50 BMG.50 Browning an equipment Gun, 50 Browning, .50 cal
10mm Auto10mm, 10mm Automatic
5.56×45mm NATO5.56 NATO
5.7x28mm5.7 x 28, 5.7
6.5mm Creedmoor6.5 Creedmoor, 6.5 CM, 6.5 CRDMR
7.62x39mm7.62 Soviet
7.92x57mm Mauser8mm Mauser, 8x57mm, 8 x 57 IS
7mm RUM7mm Remington Ultra Magnum
7x57mm Mauser7mm Mauser, 7x57mm , 7 x 57, .275 Rigby
9×18mm Makarov9mm Makarov, 9x18mm PM
9mm Luger9x19mm Parabellum