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Question by dbell. Uploaded on September 22, 2011
Long colt has a lip at the base of the case, for use in revolvers. ACP does not, as it is usually loaded in semi-autos. The long colt is a tad longer too.
jbird is right, but I think the word "rim" is the technically correct term to describe the flare at the base of the revolver cartridge.
Jbird and 99Ex, good answers, although both are 45 caliber, you pointed out the differences.
45 long Colt = revolver
45 acp = 45 cal. Automatic Colt Pistol
For a longer discussion of the two calibers you can
take a look at:
For the .45 Long Colt:
and for the .45 ACP:
and he stumps his toe in the dark!
Aside from the overall cartridge length and rim design, they are also slightly different in diameter. The .45 acp has a diameter of .451-.452, while the .45 Colt can have a diameter anywhere from .451-.454. The .45 acp can also be fired from a .45 Colt by changing cylinders.
One more thing. In regular factory loadings, the .45 Long Colt cartridges have a little more energy than the .45 ACP, and in modern revolvers, can be handloaded to much higher velocities without concern about the cycling mechanism as in the case of the semi-auto pistol.
At one time, I think it was S&W, sold "half-moon" clips. Each clip held 3 .45ACP rounds and held the rimless .45 ACP cases so they could be fired in a revolver.
Ruger, on the other hand, like wp stated, I think offered the "Single Six" with interchangeable cylinders.
The above pretty much covers it. The only thing I would add is it should be 45 Colt. Because at the rounds inception there was no 45 short Colt. Just 45 Schofield. 45 long Colt just crept into the lexicon.
FirstBubba- you are right! I have one of the S&W's, it was my Great Uncles', who collected all models and calibers of S&W revolvers for around 20 years. It's kind of a pain in the butt loading up the half-moons, but I bought it from my Great Aunt just because it was my Uncles', not because of its practicality.
I have a few .45 "long" Colt loads that shame a .44 mag. These are only fired in an old Ruger Blackhawk. The same revolver has a extra cylinder for .45 ACP. As much as I like the ACPs in my 1911s they sure feel anemic after a cylinder of the hot longs and then one of the ACPs. Nevertheless both are great cartridges with many uses.
45 ACP's cartridge rim is the same diameter as the cartridge for auto-feeding in semi-auto pistols. The Colt Long 45 is a revolver and also a rifle cartridge.
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