They are two very different cases, minimally the barrel and breaches are different.
None of them say. 22 short, long, or long rifle round barrel 12-A octagon barrel 12-C 22 short (octagon) 12-B 22 Remington Special (octagon) 12-CS
gunbroker.com, gunsamerica.com, gunsinternational.com, auctionarms.com what's wallstreet50live?
No such caliber as .32 Special. Use the caliber of ammo marked on the gun.
I'm guessing your talking about a Remington model 12-CS pump?If so it was made in early 1915.
One would think that .380 ACP and .38 Special would be the same size--namely 38-hundredths of an inch. But there can be some flexibility in stated caliber and actual caliber. Long story short, .380 ACP is the same diameter as a 9mm, roughly .355 caliber. .38 Special is basically .357 caliber.
38 special is only a revolver caliber. that's like saying a 44 magnum revolver or a 500 special revolver. a revolver is a revolver
Sounds like you talking about a Remington Model 12-A and a 12-CS. 12-A - 1911 12-CS - 1917
If it's a pump without a model on the side then it's a early model 12, this one was made in 1915. Which variation depends on round or octagon barrel or if it's short only or 22 remington special vs 22 rf.
.38 Special is a specific caliber. There are other .38 caliber cartridges- about a dozen. The most common OTHER 38 is the .38 S&W, which is shorter, fatter, and less powerful than the .38 Special. MOST of the different .38s do NOT interchange.
Any commercial 38 special ammo can be used in a firearm marked 38 special caliber. (Remington,Federal,CCI,Fiocchi,etc.) The Colt serial number guide that I found on the internet says Colt Detective Specials with an "M"after the serial number started with the year 1975. The gun should have a shrouded extractor rod.
A polygon with eight sides, regular or not, is an octagon. There isn't a special name for a regular octagon (other than "regular octagon").
.22 WRF or .22 Remington Special