Here is picture of case fired 25 times,
in my 700HE test barrel, to show you
how cases stretch and thinout from
repeated firings of high pressure loads.
You can see where it is thinning just
above the belt. Half of the loads were
high pressure loads. Regular 10,000 ft
lb loads wouldn't stretch cases at all.
This is made from bmg brass like our
12GA FH. 700 is belted and 12ga has rim.Ed