Bore obstructions can & will happen.
We had a close call shooting sporting clays yesterday. My shooting buddy had one his 28ga reloads have a case separation on the shot. Luckily, he extracts his shells rather than ejects them & on this one only got the brass with about a 1/4" of the plastic case back when he extracted the spent round. The reminder of the hull was about two inches down the bore & had heat fused itself to the bore. It took us close to a half hour with two different cleaning rods to finally dislodge the case from the bore.
I'm just glad that my friend was shooting an O/U rather than a semi-auto. This was on his first shot at a true pair and if this was a semi-auto he probably wouldn't have seen the partial case get ejected & we probably would have had a barrel burst or worse.
I suspect that something along these lines is probably what happened with the burst barrel on the Kemen in this thread.
We just had a close one--be attentive & careful--your health & gun depends on it!
