Thread: Interesting...

As I mentioned in another thread I was doing some shooting in the rain and although my ammo was dry it was hard to keep your hands dry so the ammo picked up some moisture on its way to the chamber. Once I got home the ones that had some moisture on had a nice round stamp on the head and a crescent shaped indentation on one side of this with the brass starting to shave off around the indentation
This is Lapua .308 brass necked down to 7mm08. I will back it off half a grain to give a bit of grace and keep the load a bit more useable across varying conditions. The interesting point however was I measured for case head expansion comparing the rounds fired with no pressure signs to the ones which carried moisture and produced shavings and there was no difference...
Bit of a head scratcher and some may say that this would suggest the loads were already too hot but measured some lighter loads too and they were the same.
Thoughts?