Brass on WWB and American Eagle. Blazer could go either way.

 

Winchester white box is brass case, copper jacketed lead.
American Eagle is brass case, copper jacketed lead.
Blazer Brass is brass case, copper jacketed lead, but you can get Blazer in aluminum case as well.

Steel case is actually kinda rare here in the US. It is mostly Russian made ammo. Most common brand I have seen is Tula, but I still have some Wolf I use when I am shooting in the snow and don't want to go digging for my casings.

 

Steel is Russian ammo like Tula, Wolf, Bear and some variations. I normally only shot my AK's with it, but it is fine in other calibers if you need to save $.

 

Winchester To Offer Steel-Cased Pistol Ammo - Shooting Sports Retailer
Winchester will be introducing/selling a line of steel-cased ammo this year. I don't believe it will be in a white box, however.

 

Sure seems like it was in a white box in WalMart just last week. 100 rounds, loose. Took a bit of searching to find the 'steel' info(looking through the Plexiglass doors ) . Wasn't all that cheap.

 

Federal make an Aluminum cased ammo that comes in a Purple box. Walmart sells it

 

Its actually one of the best deals out there. I like Perfecta also, but last time out, it was a flamethrower.

 

Freedom Munitions recently introduced a line of factory-new ammo that is made with brass-plated steel cases. It's called American Steel.

 

Caliber may be different, but is a good read...

Brass vs. Steel Cased Ammo - An Epic Torture Test