I might be missing something here, but it needs to be said that the brass Winchester uses in its premier, very expensive ammunition is the same brass it uses in its bargain priced white box stuff. For some reason, there seems to be a misconception floating around that white box ammo is cheap, and therefore the components are of lower quality.
The last time I checked prices, it was less expensive to purchase white box ammo to get brass than to purchase empty cases and load them yourself for the first go-around. By that, I mean 100 empty cases, 100 primers, propellant charges, and bullets exceeds the price of the white box "value pack" at Wally World, and I believe it is one item that Wally sells that doesn't enrich the Chinese.