I am looking for the highest capacity reliable magazine for a Sig P229 (.40 S&W). As of now, I run 15-round factory Sig P226 magazines in my P229. As expected, they work wonderfully! I have seen a 20-round magazine from ProMag (ProMag Sig Sauer P226 .40 S&W, .357 Sig 20-round Steel Magazine). I am wondering if anyone has experience with this magazine and, if so, would recommend it? Also, I am wondering if anyone has other suggestions for getting more than 15+1 capacity out of a Sig 229? Finally, is there any believe that using a magazine in excess of 15 rounds would unduly wear any of the parts of the gun? Thank you!