.38 special in .357 magnum.....why not .380 or 9x18 Makariov in a 9mm? [Archive] - Glock Talk

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finz50
10-08-2010, 20:16
Dumb question that I've been wondering about lately and was hoping someone could give me some insight on. I am aware that you can shoot 38 special out of 357 magnum revolver with no problems, even though the 38 special casing is shorter than the 357 mag casing. If that's the case why couldn't someone shoot a 380 Auto or 9x18 Makarov out of a 9mm, since the diameter is the same, but the casing is shorter (IMO like the 38sp and 357 mag)? What's the difference?

ronin.45
10-08-2010, 21:16
Most 9mms headspace on the casemouth so a 380 could be pushed too far into the chamber for the extractor to grab. If the extractor does grab the rim the cartridge will fire but it lacks the energy needed to cycle the slide. I'm not sure of the exact dimensions of the 9x18 but it should have similar results.

Zombie Steve
10-08-2010, 21:42
Yep. Headspace. .357 mag and .38 headspace on the rim... .380 and 9mm headspace on the case mouth.

OkieGunNut
10-08-2010, 21:49
I have picked up 9X19 brass that has been fired in a 9X18 chamber. One might suppose that the higher pressure of the 9X19 would be dangerous in the 9X18; but, I guess the larger bore size (.365 compared to .355) allows enough blow by to keep it "safe". Also the case has a line where the end of the 9X18 chamber marks the 9X19 case one millimeter from the mouth. This may help retard the extraction.

NonPCnraRN
10-08-2010, 22:54
Not only is the 380 ACP shorter than the 9 mm, but the diameter of the .380 at both ends of the cartridge is smaller than the 9 mm. I would think you would have some case ruptures if the round was held by the extractor so the firing pin could strike the primer.

fredj338
10-08-2010, 22:55
The 380 & 9mm are not the same case size. They share the same bullet dia, but not case head. The 9mm is a tapered case, the 380 is straight walled. The 9x18Mak is a larger bullet & case size & would cause a real problem fired in the 9mm.

Wil Terry
10-09-2010, 09:44
It's the very thought of a 9MAK .363" jacketed bullet roaring like hell towards a .355" barrel that excited the handloader/ballistician in me to NO end !!!

Glolt20-91
10-09-2010, 11:32
It's the very thought of a 9MAK .363" jacketed bullet roaring like hell towards a .355" barrel that excited the handloader/ballistician in me to NO end !!!

There is a rather graphic visualization to your statement. :wow:

Bob :cowboy: