Will a 228 mag fit in a 229?

If your P229 is a 9mm you can use the P228 magazines. They will seem loose, at the base, in the mag well as they are slimmer than the P229 mags.

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Guns cause crime like spoons cause Rosie O'Donnell to be fat!
 
The short answer is yes.
A 10 or 13 round 228 9mm mag will function in a 9mm 229. You can load .40 or .357 SIG into one of the 9mm mags, but not the same capacity IIRC. I don't know if they will feed reliably, because I made sure I traded the magazine back in when I found out it was a 228 mag (I bought a 229).
 
You could only load .40 S&W into a 9mm magazine if you bend, or trim, the feed lips. The 9mm rim is .394" and the .40 S&W rim is .424". They are not interchangeable without modification.

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Guns cause crime like spoons cause Rosie O'Donnell to be fat!
 
I know 226 9mm hi-cap mags will feed reliably into my 226/40 and my 229/357, and I did not modify them at all, not a single problem. The MecGar's hold 13 rounds of 40sw.
 
I believe that P228 and 9mm P229 mags are the same thing. They even have the same SIG product number (280050-10, for the post-ban mag). The P229 frame is derived from the P228 frame--hence the identical mags.
 
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