Its always gone bang for me. So not bad ammo. I haven't had a bad round either. I shot a mix of S&B, federal, and Fiochi recently. All cheaper budget line target ammo and I noticed a lot more smoke from the S&B than the others.
I've always thought WWB was some of the dirtiest ammo. It didn't take long to sell out at that price. I'll keep an eye out for more. Others usually find it, post it on other sites, and I just copy and paste here.