I have only seem one barrel burst. It was a CVA
kentucky rifle my buddy was shooting. He had just finished the kit and was shooting on the line next to me when I felt something hit me on my left side and he was standing there with a burst barrel and shattered stock. No major injuries, just some powder burns. I think what hit me was pieces of the stock.
Well we took the CVA back to the Patch and Ball gunshop in San Diego. My friend Bill Bracken, who has since passed away, inspected the barrel and said the ball was probably not seated all the way down on the powder. Bill happily replaced the CVA Kentucky, no questions asked, and my buddy got back to shooting.
This was back in 1975. I suppose in today's world
there would have been a lawsuit against CVA, Bill Bracken, and his shop.