So, I took my P-10C to the range. I shot 200 rds of Winchester White Box 115gr. At about 160 rounds in, I loaded a fresh mag and hit the slide release. The slide went almost all the way into battery but with about a half inch sticking back. I tried to smack it into battery but no luck. I then tried racking the slide but it would not budge. I ejected the mag and it took a lot of strength to pull the slide back. This happened a few more times.

I called CZ-USA today to see if it was a problem with the pistol. The rep on the phone told me that they have had some previous problems with WWB ammo before and to use a different kind. He did say if I have any problems in the future to send it in.

On a side note, I got a heck of a blister on the top of my shooting-hand thumb from the back part of the grip right at one of the retaining pins. I also got a blood blister on my shooting hand pinkie finger from the gap between the frame and the magazine.

WWB is crap, SGAmmo and others have Geco, and CCI Lawman, both are much better and the same price or cheaper.

+1

Agreed!

My G19 had issues with WWB failing to go into battery due to excessive case length on several rounds.

This right here.  I'd rather let someone shoot wolf in my gun than WWB.

I actually think that brown bear Russian steel case is better than wwb or rem.  

The only ammunition issues I have ever had was with Speer GDHP (once) and WWB (three times).

I'm phasing my WWB out...not what it used to be IMHO. Going to start using S&B.

I just ran 100 rounds through my P10c yesterday without a single issue.

Ran my last 100 rounds of WWB through my P-01 yesterday and had 2 that failed to go into battery. So glad they are all gone.

WWB is junk

my P-07 has a short leade, CZ barrels are known for that

I set my handloads to OAL 1.099" IIRC, so they fully chamber

i wouldn't worry, mine eats 124gold-dot +p and 147 HST just fine

.

Winchester Cheap ammo is Cheap ammo.

Let's put it this way,  I have even have the cheap Win Shotgun shells fail to feed, in my Over-Under.  

I agree it's pretty dirty, but I've never had an issue with it (I've even had some that felt hot).
I use American Eagle 124gr, but WWB has never had an issue in my guns (almost all glocks).
If I can find some boxes, I'll take them out with the P-10C on Monday.

I just ran 50 rounds of WWB 9mm 124gr NATO in my P10c yesterday with zero problems.  

I think I have 250 rounds through it now with half being wwb and no issues.

What is this "buy" you speak of? Seriously, I haven't touched WWB in probably 10 years.

I have had 3 wwb rounds that had case lengths in excess of .050 over max saami dimensions.  The cases were closer to 9x21 than 9x19.