Depending on how far you go with the spring upgrades, light strikes can occur with certain brands of ammo. BA or the Wizard would be the ones to chime in on that. I don't run a whole lot of steel, but know others do with good luck.
Yep, some brands of ammo have harder primers than other brands. Blazer Brass is one I've used that seems to be just fine, as well as Speer Lawman. As Rusty said, BA and the Wizard would have more brands that they have run that are safe.