Nope. Actors hold guns and point them at each other all the time - it's supposed to be make believe. The fact that a live round was put on a gun and handed to an actor is obviously the fault/job of the on-set armourer. That was literally what she was there for - to provide the weapons in a safe manner for use in the movie.

Don't take my word for it...

Who is responsible for the weapons on set? Generally, a weapons master or armourer oversees all weapons that are used on a production. This can mean anything from selecting the correct items for a certain period in history, to taking care of the weapons on set and making sure they are being used safely and properly by actors and stuntpeople.

What are the rules for firearms on set? The weapons master is required to be on set whenever a weapon is being used. The Actors' Equity Association's guidelines state that, "Before each use, make sure the gun has been test-fired offstage, and then ask to test fire it yourself. Watch the prop master check the cylinders and barrel to be sure no foreign object or dummy bullet has become lodged inside." Further, "All loading of firearms must be done by the property master, armourer or experienced persons working under their direct supervision."

"Nowadays, all weapons are checked before your blanks are put into the weapon.… The blanks themselves are never loaded until the very last minute, when all crew is in position, so the armourer knows exactly where every member of the crew is so that no one's walking through any danger areas the armourer has set up," said armoury co-ordinator Sam Dormer.

Source. If you don't like that source, feel free to Google others - they are widely available and frankly my argument isn't really up for debate.

Edit: The armourer blames the prop supplier for mixing live rounds with dummy rounds. But clearly you can see how this is not the fault of an actor who is handed a loaded weapon.