.380 VS 9mm

[blackhawk8]

is the .380 cartridge the same size as 9mm except for the length ?

Thanks

 

[Shadow9mm]

No, its smaller.
9mm rim diameter .394, mouth diameter .380
380 rim diameter .374, mouth diameter .373

 

[Ed4032]

Not very much different.

 

[Shadow9mm]

Not very much different.

Rim diameter is about 5.1% different.

Question is why the comparison? To begin with you could not trim a 9mm down to use it for 380, its too wide. And a 380 wont headspace in a 9mm since it headspaces off the mouth and its too short.

 

[Aguila Blanca]

.380 ACP is also a straight-wall (cylindrical) case, whereas the 9mm (9x19) is a tapered case.

https://saami.org/wp-content/upload...FP-and-R-Approved-2015-12-14-Posting-Copy.pdf

 

[cdoc42]

Confusion may be created by the relatively long list of alternate names: Other names for .380 ACP include .380 Auto, 9×17mm, 9mm Browning, 9mm Corto, 9mm Kurz, 9mm Short, and 9mm Browning Court

 

[ballardw]

And Corto and Kurz mean "short"

 

[FITASC]

Bullet weights for the 9x17 tend to be lighter than for the 9x19