Quote:
Originally Posted by Brian Dudley
How did he KNOW it w steel stuck together that caused it?
A little difficult of a situation to know what actually happened.
One could only speculate.
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Sorry for the lack of clarity.

Unless one had been in the hull at the time of firing, riding the wad and shot column through the barrel, accompanied by a metallurgist with a VERY expensive camera, there's no way one could truly KNOW what happened.

I plead guilty to making an assumption and stating that shot appeared to be the culprit.
Additionally, he cut open some shells and found rust.
I inspected some new winchester shells that I have and (here's that word again) it appears that the melt job on some of the crimps goes clear through the plastic thus providing a path for moisture to reach the shot.
As far as the powder getting wet, the wad can form a fairly good seal. Perhaps it's possible to get the shot wet but not the powder.