I just got off the phone w/ a Kahr rep after asking care questions for night sights (my first on my PM9 ), and I asked about ammo brands, he wouldn't give a nod to any brand, but said to stay away from Wolf (nasty stuff IMO) and Winchester White Box ! He said they are getting complaints about it and are suggesting people stay away. It has always worked great for me and have had ~250 rounds through my PM9 w/o problems. Anyone heard if Winchester changed the specs on the USA WWB ammo? Anyone suddenly having problems with it?