Alec Baldwin was usually careful with weapons on the film set of “Rust” before he allegedly shot and killed a photography director last week with a gun that he was told was safe, according to court records that were unsealed on Sunday citing a camera operator. Cameraman Reid Russell told officials that Baldwin was rehearsing a scene in which he was drawing his gun to point it at the camera. Russell said it wasn’t clear whether the gun was checked before it was given to Baldwin, according to the court papers. When he fired the weapon, it was being pointed at the camera, according to the court documents. Russell also said that Baldwin, recently known for his “SNL” portrayal of former President Donald Trump, was typically careful when handling firearms on set, noting that the actor once made sure a child actor wasn’t near him when a gun was discharged. …