Robert Patrick and Kristanna Loken both played evil terminators in Terminator 2: Judgment Day (1991) and Terminator 3: Rise of the Machines (2003) (respectively).
When Sgt Cutler and the team are in the bar and playing the boxing game, after Kellog takes his turn and Cutler takes Kellogs gun he takes the clip out and he cycles the slide, when the bullet hits the floor you can hear that the cartridge was empty (no bullet or powder).
When Walter Hatch shoots the FBI agents, he is in the back of a car, shooting both agents in the back of their heads. Next day, when the police arrives at the crime scene, it clearly shows that at least the co-driver is shot through the forehead.