I recently traded a 9mm P320c for a .40 P320c. I was having ejection and brass to face problems with the 9mm. After sending it to Sig, it still wasn't fixed. I had been wanting a P320c in 40 so I decided to trade it. The trade only cost me $50 at my LGS. I've put about 100 rounds of 180 Blazer Brass, 50 rounds of 180 HST, and 50 rounds of 165 Lawman through it. Not a single problem. I will say that with 180 grain ammo, there is little difference in recoil compared to 9mm +p ammo. But when I shot the 165 Lawman, there was a definite increase in recoil. So if anyone wants a change from 9mm, the .40 P320c seems pretty good. There is fantastic defensive ammo available at cheap prices. And the recoil from 180gr is negligible. I'm looking forward to shooting steel and bowling pins.