I never fire steel cased, but most everything else seems to run fine for me. I usually use the Remington 102 grain Golden Sabers for street carry, and just about any brass cased ball ammo for practice. I have noticed one thing on just about any Bersa I have ever owned though, and that is after about 80-100 rounds, I start to experience some FTF or FTE. Mine seems to be sensitive to crud build up. Other than that, their great guns.