Important question: M&P .40c mags marked .357

[FireInCairo]

Ok, I just bought a used S&W M&P .40c from the local shop. My assumption is that it's standard .40 S&W caliber, so after my purchase I went to WallyWorld and bought some .40 caliber ammo.

Then I get the gun home and as I'm looking at the magazines, I notice they say:

40 S&W
.357

All three magazines (there is a full-size one included) say this.

The shop owner didn't make any mention of this. I assumed it's .40 caliber, but then I know you can get the .357 barrel for these, too. And the gun is a consignment sale, so there could be confusion or miscommunication. I'm new to semi-autos, so I could use some advice.

Do your M&P .40 caliber, stock magazines say ".357" on them?

 

[FireInCairo]

The .40 caliber ammo fits these mags perfectly. Why do they have .357 written on their side?

 

[wow6599]

They were probably made for the M&P 357........they are the exact same magazine as the 40 though.

 

[basicblur]

Do your M&P .40 caliber, stock magazines say ".357" on them?

Don't have a 40, but I do have an M&P 357 SIG and the magazines say 40S&W / 357.

 

[9mmepiphany]

You are fine.

S&W uses the same magazines for the .40 and 357SIG (there is no decimal point in the name of the cartridge) models. The .40 is the parent case for the 357SIG and they regularly share the same magazines

 

[FireInCairo]

Thanks for chiming in.

 

[Sam Cade]

357SIG (there is no decimal point in the name of the cartridge) models.

Hunh.

I learned something today.


Had to look up the SAAMI spec before I would believe it though.

http://www.saami.org/PubResources/CC_Drawings/Pistol/357 Sig.pdf