.357 Sig and .357 Mag

[BigBear]

Okay, I know there are some differences. Google-fu worked up to that point.

Question is, Which one does hte Glock .357's use?

It's my understanding that the .357 Sig was made for semi-auto pistols while the Magnum is more for wheel guns....

but are they interechangeable?

[TFOGGER]

The .357 Sig is a rimless case based on the .40 S&W(necked down), which in turn is based on the 10MM auto. The .357 Magnum is a rimmed case based on the .38 Special, which in turn is based on the .38 S&W Russian. The two cases bear no resemblance to each other.

The Glocks (and most other auto pistols) would use the .357 Sig.

.357 Magnum
http://www.leverguns.com/articles/fryxell/images/357ammo.jpg

Next to the .357 SIG
http://i43.tinypic.com/2zqh35x.jpg

[BigBear]

Supposedly they are both close in terms of ballistics, stopping power, etc though right?

Just wondering if a .357 would be a good collection to my pistols...

[Irving]

I was just looking in my midway catalog that arrived last night. .357 mag can throw a 125gr bullet at like 1700 fps and .357 sig can do the same grain at like 1400 fps. I think. I'll have to check again when I get home. I'd suggest going to a specific bullet manufacturer's site and checking what they sell, then check a different company. This will give you a ball park feel for what is out there.

[rhineoshott]

.357 SIG is the best pistol cartridge IMO. It has the power of a .45 ACP, case size of a .40, and a bullet size of 9mm. Very high velocity cartridge. I like to think of it as ideal in a large "assault pistol" type (like an HK Mark 23), and .45 ideal in a compact 4" sidearm (back up to a carbine/battle rifle).

[TFOGGER]

Not a lot of difference, although the .357 Mag has a slight edge in velocity/energy at the muzzle:

http://www.federalpremium.com/products/print/compare/handgun_compare.aspx?compare=328%2c105

http://www.federalpremium.com/products/GraphPages/CompareGraphs/velocityCompareGraph.aspx
http://www.federalpremium.com/products/GraphPages/CompareGraphs/energyCompareGraph.aspx

Blue Lines represent .357 Mag, Red is .357 Sig

[Irving]

Keep in mind that is only one manufacturer as well. Some have hotter loads than others.

[cowboykjohnson]

.357 Sig is a good load but can be hard to find factory ammo if needed.

[BigBear]

.357 Sig is a good load but can be hard to find factory ammo if need.

Do you think that's why most people prefer the .45 as a carry weapon?

[cowboykjohnson]

Thats why I do![Beer]
my buddy has a .357 sig, it's fun to shoot and powerful, but we can hardly find ammo for it... especially at a reasonable price.

But I have a 10mm I love, and carry in the woods... which can be hard to find ammo for a times.

[Graves]

No, they aren't interchangeable. When it comes to matching the performance of the magnum, the sig is a bit of a one trick pony. The 125gr loads are about the only to come close to magnum power levels, anything heavier just doesn't come close. If you want a powerful Glock, get a 20 or 29.