Thanks for the input, folks. Got fired from my job the other day and figured it would be a good time to shoot my new CZ 83.
A quarter of the UMC's misfed and had to be manually guided into the chamber. They sucked. Misfeed hell. Not fun when your a big man with sweaty hands trying to manipulate a slippery new little gun.
Had absolutely no problems with the Winchester. Well, one misfeed, no doubt due to the presence of a UMC round in the magazine.
No problems with extraction; didn't anticipate any. Beautiful gun and I anticipate it will be more functional with increased use.
As for accuracy; I hit what I was shooting at: old Coke cartons placed 20 - 50 ft in front of me (no, not at my boss).
Tristan