There have been several manufacturers listing on their box the ammo as 45 LONG COLT. Armscore, Fiocchi, HSM and even Colt, to list a few.
I’m away from my books for a couple of days but best I remember the confusion started shortly after the introduction of the 45 Schofield (1875) for a more controllable, quicker loading firearm/cartridge than the 45 Colt (1873). Best I remember, several synonyms were used to describe the Schofield cartridge such as “S&W”, “Government” and “short” or a combination of the various descriptions. This started the need for a description of the 45 Colt, apparently “Long Colt” seemed appropriate. There was a slight modification to the Schofield case and it was adopted as the M1887 military ball which had near the same dimensions. This modification is more probable as the result of the “long” and “short” designations.
The 45acp (1905) probably had no bearing on the confusion of the two above. But certainly didn’t help.
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