I don't reload much rifle ammo but I can tell you I have definitely seen differences in various manufacturer's pistol brass. Haven't noticed any significant differences in the 'name brand' stuff though. Winchester, Remington, Federal and the like, it's all good from what I've seen. It's when you get into some of the oddball (read: cheap) makers that they can get strange. For fireforming I'd definitely want good stuff since you're going to intentionally deform it.
Midway does sell 280AI brass from Norma. Good stuff there, but kinda pricey.
If you happen to run across any AMERC .45, pitch it! After smashing it to uselessness. (Actually, it's already worse than useless, you need to make it unusable.
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