Update: Just got the pistol back from SIG for the second time. First time they inspected the pistol, "detailed the breech face", replaced the extractor SPRING, and test fired 50 rounds.
Got it back, still FTE. Sent back to SIG and they had it a couple months. Replaced extractor and included a spare extractor in the box.
Cleaned, lubed, and test fired yesterday, around 160 rounds. 40ish rounds Herter's select brass cased 115 FMJ (made by Fiocchi I believe, possibly S&B), 100 rounds PMC bronze 124 FMJ, and 6 rounds Hornady 115 Critical Defense, 15ish rounds Speer Gold Dot.
Results... ZERO FTE!! Yaaay!
However, one FTF with hornady, one failure to return to battery with PMC (extractor didn't slip over the rim), and multiple light primer strikes/failures to fire with Herter's. All herter's fired when re-struck a second time.
Primer strikes have always been very light on this pistol, and I had one failure to fire in previous shooting. Is a longer firing pin available? I don't suppose a lighter firing pin spring is a good idea... right?
Video for any interested.
http://www.youtube.com/watch?v=2oZ1cBlCxSo