Hi All,
I saw two blown firearms years ago. One was a 45-70 trapdoor fired with hot modern rifle loads, BANG heard the guy yell -I turned & saw the barrel sailing down range. He caught some case fragments in the face, chest and upper arm.
The other was a SHOTGUN news sales item A Nagant 7.62 x39R cylinder. rechambered to 7.62 Tokorov. The cylinder came apart do to the much larger powder load & thin remaining chamber walls. The shooter & his pal were hit with large chunks of cylinder fragments in the head & neck.
Be safe,
broomhandle