Thread: Random pressure signs?

I read a thing a while back on some tests done on resized brass:
Basically the test was on measuring the down ward pressure on the bullet to seat in the neck of the case.
The pressure on the freshly resized brass was less than some that same batch of brass loaded a few weeks later.
It soundsg strange but it looked as if the brass hard hardened over time.
The article was on 6 mmbr.com I will try to dig it out.
One of them:
Neck Tension 101 — It Ain’t As Simple as You Think « Daily Bulletin

Point number 9

http://bulletin.accurateshooter.com/...e-time-factor/

This one is the better one