Desert Gator, many on this list like Walk Along refer to specific cartridges as "Caliber's this is incorrect use of nomenclature.
Each cartridge has a number of unique characteristics, caliber being one of them.
The Calilber only refers to the bore - the inner diameter of the barrel. to the rear of the bore is the chamber which contains the case of the cartrdige, the bullet is resting at the entrance to the bore in a semi-auto. In a revolver it sits in the front of the cylinder. so,
.38 Special = .357 Diameter bullets
.357 Magnum = .357 diameter bullets but the case is 1/8" longer
.380 Auto/ACP = .355 diia.
9mm luger was first called the
9mm parabellum = .355 dia.
.38 SUper = .355 diameter and the rebated rim that Walkalong called it means the rim is actually slightly smaller in diameter than the cartrdige case .
cartrdges created in the year:
.38 Special 1899
.38 ACP/Auto 1902
they're low pressure because this was when smokeless powder was first
being used pressure ranges are in the 18000 PSI generally
Higher pressure = 35000 or higher and thse include the
other three 9mm luger, 1902, .38 SUper 1929 and the
.357 Magnum 1935.
So, you see cartrdiges can have the same calilber, but the shape or
lenth of the case is different but some have the same caliber.
WHew...
Randall
9mm Luger
.