looks like they used too fast of a powder, maybe rifle powder. They where going for a 3500 fps .44spc
I do hope they are OK.
According to the email, it was a 240 grn .44 magnum double charge. I dont know enough about powders to know if its fast burn, rifle powder or friggin baking soda. However, if they achieved 3500 fps out of a .44 mag, they definately went about it the wrong way....
Nothing said about whoever was handling it when it broke. Hope they're ok to. That'd make one for one hell of a surprise.
The S&W line was me, touting on my ruger
... I'm am aware that even they would fail with a big enough charge.
edit: found this on ehowa just now, with a link to go with it. pretty much says the same thing.
http://www.ehowa.com/features/explodedrevolver.shtml