normally the companies that sell reman and cheaper ammo use cheaper powder which makes it "dirtier" . the two go hand in hand.
the worst I have ever had was the ultramax from dick's. I tried to shoot some during an idpa match and was told if I didn't have other ammo to switch to that I couldn't keep shooting because it was causing so much smoke on the range lol
I would have told them to piss off, and they needed better ventilation.