There are several different types of .38 cartridges. The main thing which separates the .380 from the rest of them is that the .380 is intended for use in an unlocked breech pistol, whereas most of the other rounds are too powerful to be used in such a pistol. The .380 has a bullet diameter if .355 inches, and the metric designation for the cartridge is 9x17mm.
The most common .38 cartridge would be the .38 Special, which has a bullet diameter of .357 inches, has a longer case, and the most obvious difference is that it uses a rim, as opposed to the rimless design of the .380 ACP.
You may also have the .38 Super in mind, which is a cartridge intended for autoloading pistols, and still remains popular with competition firers. It has a bullet diameter of .356 inches, has a 22.83mm case length (vs. the 17.3mm case length of the .380), and much higher chamber pressures than the .380 ACP, making it unsuitable for the simple, unlocked breech pistols of the type commonly chambered for cartridges such as the .380 ACP.
the 380 is a 9mm short
The case of the 9x18 cartrdige is 1mm longer and the slug is slightly wider. In metric .380 ACP is 9x17.
Generally speaking, the .45 caliber bullet is larger in diameter and heavier than a 9mm bullet.
The .357 has a longer case and a heavier bullet; it is identical to a .38 in diameter but far more powerful. This is why a .38 will fire in a .357 but not the other way around.
The diameter. A .41 cal is about 41/100ths of an inch, and a .44 cal about .44/100ths of an inch, In real life, the measurements may be slightly different, but in general, the .44 cal is larger.
22 caliber is the diameter of the bullet. 22 cal. comes in BBcap, short, long and long rifle
Both terms describe the diameter of the bullet in decimal parts of an inch. For example, a .357 bullet is 357 thousands of an inch in diameter and the .45 bullet is 45 hundredths of an inch in diameter. These labels of bullets are most common in the United States. Much of the world refers to bullet sizes in metric terms, i.e. 9mm means a bullet that is 9 millimeters in diameter.
Two different sizes. .32 is .320 inches in diameter, .380 is, well, .380. There are different .32 cartridges for revolvers and automatic pistols, the .380 is for automatic pistols. The .380 also has more power than a .32 auto.
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diameter