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Sig P229

Trxster
I just got a .40 cal sig 229, and have been looking into conversion kits. While looking I saw a .40 cal 229 for sale with a .357 barrel. My question is do I need a new slide to fire .357 or can I just buy a new barrel? It seems the clips are the same, but I am not sure .357 cases will clear the breach.
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6 comments

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  • Trxster
    The sig 229 in 40s&w can shoot 357 by changing the barrel right? And they both use the same magazine?

    Remember to Smile!
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  • rufe-snow
    The cartridge is .357 Sig, which is the .40 S & W necked down to 9mm. Don't get this confused with the .357 revolver cartridge, which is a completely different rimed cartridge.

    All you would need to convert your P229 is a .357 Sig barrel.
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  • Txs
    Same slide, recoil spring and even magazines. In fact, notice the tubes are stamped .40 S&W/.357 SIG.

    All the P229 needs is the extra barrel to swap between these calibers.
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  • beantownshootah
    quote:Originally posted by Trxster
    I just got a .40 cal sig 229, and have been looking into conversion kits. While looking I saw a .40 cal 229 for sale with a .357 barrel. My question is do I need a new slide to fire .357 or can I just buy a new barrel? It seems the clips are the same, but I am not sure .357 cases will clear the breach.


    As mentioned the 357 SIG/Auto cartridge was specifically designed to be compatible with guns that run .40SW/auto.

    All you have to do to go from .40SW to 357 SIG or vice versa is to swap the barrel. Magazine, springs, and slide stay the SAME.

    In your case, a new 357 SIG barrel for your 229 will run you about $160. One source here: http://www.topgunsupply.com/sig_p229-conversion-barrel-357-sig.html

    Note that 357 SIG/auto is NOT the same as the .357 Smith and Wesson magnum revolver round, though SIG deliberately gave its auto round a similar name to capitalize on the excellent reputation the revolver round enjoys.

    357 SIG puts on a nominal 9mm (ie .356 caliber) 124 grain bullet at about 1350 fps, which falls just short of the 1450fps you'd expect from a true 125 grain .357 magnum revolver round.

    IMO marginal benefit of 357 SIG over .40SW is small. You can buy 135 grain 40SW rounds that yield 1300(+)fps, for nearly identical ballistics too, if you like. The miniature rifle-round bottleneck shape of the .357 SIG potentially increases feeding reliability, but it also leads to its own set of issues when reloading.

    Also, note that the 357 SIG is not *exactly* a 40SW case necked down to .357. In other words, you can't convert 40SW brass to 357 SIG brass just by necking down the .40SW cases, since they'll be too short. But the rim diameters, case diameters and overall round lengths are similar, so the two rounds should run fine through identical magazines.
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  • 62fuelie
    I have been using this very combination for at least 15 years. I bought a P229 .40 S&W and then bought a BarSto Precision .357 Sig barrel for it. Both are excellent shooters and this gives the weapon an added degree of flexibility.
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  • Trxster
    Thanks so much, this really cleared things up. [:)]
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