In general, a .38 Special +P+ load can be more powerful than a mild .380.
.380 is the calibre. It's described as .380 in order to avoid confusion with .38 calibre cartridges. In metric dimensions, it's known as 9x17mm. The diameter of the bullet is .355.
10% of 380 is 38. 380 + 38 = 418 or 380 x 1.1 = 418
Calibre 38 - 1919 was released on: USA: 16 February 1919
The 38 special will be in a revolver and the 380 ACP most probably a semi-auto. However some of the energy of the bullet is used to eject and reload the 380 which dampens the recoil a bit. Also the .38 special is actually 0.357 " diam and the 380 is 0.355". The upshot of it all is that the .38 would have more recoil.
.002 inches in bullet diameter. While the bullet is a bit smaller as noted in the answer above the handguns that use these cartridges are very different. A .38 is usually a .38 special, which because of it's rimmed case is predominatley used in revolvers. A .380 is a rimless cartridge used in easily concealed blowback automatic handguns. The .38 special revolver has about 20% more stopping power than the .380 automatic. Both are considered adequate but not powerful personal defense arms.
thirty-eight 380 / 10 = 38
Bullet diameter on a 38 is .357; on a 380 it is .355 Case is longer on a 38.
The least common multiple of 38 and 10 is 190.
No. 38 = .357 projectiles; 380 = .355 projectiles from a shorter case
38
It's 38!
You can get a letter from Colt.