I think the market has spoken on the 10mm short, popularized by the FBI adopting a female friendly version of the real 10mm. There was never anything wrong with the 9mm's performance that the 40 SW was a cure for. The 40 SW fugged up my favorite version of the Sig P226's that were made in Germany and were perfectly balanced for the 9mm. When the 40 was introduced to the P226 platform the slide weight was increased and beefed up to accommodate the added recoil energy. A 9mm P226 is now analogous to shooting a 20 ga. shotgun that was built on a 12 ga. frame.
