So,
I watched this diatribe. Nowhere was there ever mentioned hardness as measured in ANY scale of the lower section of the brass used. Not any tracking of a hardness value after any number of firings. Not a hint about a actual amount of expansion/contraction at any pressure value. WTF: is this guy a medium of sorts?.
Brass only gains hardness from work hardening. Roll it, compress it in some manor, move its size.
simple fact: don,t over pressure and your quality brass will last a long time.
overload once and kiss it good by.
Ask yourself why small primer 308 brass was reintroduced via request by Palma shooters some 10 years ago. Cause it withstands an additional 3500 psi.
Should anyone be curious enough to want to know, send me a few pieces and I will run a hardness test in both B scale Rockwell and Brinell.
ALAN