These are from the law enforcement documents that the LA Times posted...
According to law enforcement documents, during a rehearsal the film’s assistant director, Dave Halls, had handed Baldwin a replica of a vintage Colt .45 pistol, pronouncing it “cold,” meaning there was no ammunition inside. But the gun contained dummy rounds, and at least one lead bullet.
Gutierrez Reed (the armorer), according to affidavits filed by the Santa Fe County Sheriff’s Office, had loaded the weapons that day, but she told sheriff’s detectives that she didn’t realize that actual bullets were contained in a new box of ammunition that arrived on set that day.
Gutierrez Reed told sheriff’s detectives that although she checked Baldwin’s gun that day before the unscheduled rehearsal, she “didn’t really check it too much,” because the weapon had been locked in a safe during a lunch break.
From the law enforcement docs, it appears that the armorer Gutierrez Reed put at least one real bullet in the gun.
If there's a trial for the actor, I hope objective jurors (without jealousy or animosity against him) are chosen.