Don't buy fired FGMM brass. I pick up brass all the time. Lately I've been tossing a third away due to head separation signs. You can't see it till you size it. If you want an awesome FGMM substitute, buy Lapua. Don't have to do a thing to prep them. They turn my rifle into a laser gun. Better groups than with any other brass and I worked up loads for each make.
PMC seems like good brass, although they all have off center flash holes. It's heavy, weighing like LC, with similar internal capacity. There are two different batches of PPU, one weighing 15grs more than the next, so you should weigh yours and separate them. RP is like Hornady but has softer necks.
My preference is LCLR, then Lapua, then it used to be FGMM but now I'm reconsidering.