Geez he was using an era correct single action 45 Long Colt.
The real issue is what was a live round doing on location at all. No cardboard wad went through one person and wounded the person standing immediately behind her, so suggesting that is ridiculous.
When they fire a weapon, even with blanks straight into the lens, there is a piece of Lexan placed in front of the camera between the muzzle and the lens if they are following proper protocol.
There evidently a lot of industry standard protocols that were being breached in this instance. The set Armorer is really in deep Kimchi over this, he's 100% responsible for weapon security. Allan Graf the Stunt Coordinator has 35 years in the business, lots of war movies and action movies with a lot of shooting going on. He was involved with "We Were Soldiers" and you find a set with more shooting on it than that movie.
If Baldwin's insurance was up to date as it should have been, they will pay the bulk of the freight. Just not certain they will be able to find enough evidence to support any type of criminal negligence. Money will change hands and lawyers will make a lot of money.
"We're going to turn this red Prius into a soup kitchen!"