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SiG P229 in 357
Without knowing what "better" means to you the answer could be yes, no or maybe.
Yes same frame and assembly they will interchange
No. You can get a Sig P229 that will fire .357 Sig, but that is not the same as .357 magnum.
Yes, as long as it is made specifically for the P229/P228.
No published sn data.
The P229 pistol is made in 3 different calibers- one of which is the 9mm Parabellum, also known as 9mm Luger.
The Sig P228 and 9mm P229 both use the same frame and frame assembly. The difference is that the P229 has a machined stainless steel slide, while the P228 has a stamped slide with a breech face block pinned in place. The P229 is stronger than the P228, but the P228 is a little lighter. I personally prefer the P229. The P229's tougher frame makes it better than the P228 for stronger rounds like the .40 or .357 SIG (I don't think the 228 even comes in those calibers).Yes it does amd the p228 is easyer to mass produce.
Sig Sauer P229
50-550 usd
Look on the frame.
ENTIRELY too many agencies to list here- but if you scroll down to the link that says SIG P229, it will take you to the page of Wikipedia that shows the major user.