If I remember correctly the guys on THR? said the steel cased Winchester ammo was among the worst available. I have no experience with it, but if what people write is true that is a huge endorsement for the Kahr pistol.
i bought a kahr cw9 from MM's post.
internet gospel is to run 200 rounds thru it to break in.
i run 500 thru mine.
a mix of brass, steel and aluminum.
winchester and tula ( eeek!) steel.
no problems.
too bad Kahr isnt upping their game with a ~12 rd pistol.