WVsig, thanks for the P229 history. I just wanted to clarify a couple of points you talked around but never explicitly stated.
The .40/.357 P229 frame has the same external dimensions as the P228, but the magazine well is wider to accommodate the .40/.357 mag that is wider at the bottom and tapers in at the top 1/3 to the width of the P228 mag.
Also, the first 9mm P229s were just P228 frames with a stainless steel slide, which is why the P228 mags fit the original 9mm P229. Within the last couple of years, Sig standardized the 9mm P229 to the .40/.357 frame, which is why the 9mm P229-1 mag came out, which has the wider profile of the .40/.357 mags.