No powder. As I mentioned, the bullet probably got stuck in the forcing cone and I had to drive it back into the case with the range rod. The really dangerous part is that if a shooter doesn't recognize the squib, a following shot could burst the gun and shrapnel could fly anywhere/everywhere.When I started reading the part about the S&W 500 my first thought was that you were going to say it blew up! 😂 I have a S&W 627 and the first lead boolits I loaded for it I didn’t know what I was doing and it spit lead pretty bad. It was purely my fault. Most of my reloading life I have almost always had access to cheap FMJ and JHP bullets as I lived 20-25 minutes from the Sierra factory in Santa Fe Springs, CA. Once a week they opened up their store and sold blems and seconds by the pound. The factory is no longer there but I lived off my stash of bullets for many many years. After I moved to Hawaii I tried loading lead in my 357 and the boolits I bought were too soft and I drove them too hard. The spitting was pretty bad. And accuracy was terrible. I went back to jacketed from Montana Gold Bullets for a while until I figured out what I was doing wrong. Eventually I figured it out and like Stang I load a lot of lead. And one of my fav loads in 357 are hard cast SWC or RNFP that are powder coated. Now I load for almost all my pistols except hot magnum loads. I even load lead for most of my military rifles. I just don’t push them hard. Now I cast my own.
About 2 years ago a guy had a S&W 500 about 8 stations down from me. His gun was shaving jacket metal and I got hit in the leg by a piece--it drew blood but it was quickly staunched. I found out later that he had to send the gun back to S&W for a new barrel. I'm just glad that no one was blinded--not hard to imagine with a gun that spits.
I would guess that most new shooters don't know about squibs or revolvers that spit. so I'm usually very cautious around them.
I have been hit by shrapnel from revolvers before. Never hurt other than being small cuts. Lucky I guess. Though I was almost hit by a piece of a friend’s revolver when he blew it up. I saw it go right past within a few inches of my face.