Originally Posted by
triggerjerk
Edit: Oops. Thread drift. Feel free to move or delete. Sorry....
So, assuming primer detonates, how many thou short of a 556 go guage (don't have numbers in front of me from checking my hs guage against one) might you start seeing case failure with factory loads?
Edit: go guage 1.4636. my rcbs thimble measures it at -1/2. Sized cases are -3 to -5. Fired cases from 3 different chambered guns average measure +1, +3, +4+. All guns set back factory rounds to -4 to -5 upon chambering and remeasuring. Have seen no signs of head separation except on 2 lots of ppu brass fired 2 and 3 times. No cracks, but last sizing left a hard ridge on outside of case in front of web. Have other lots of ppu fired 3 and 4 times with no signs.
Sorry, just wondering how far from the failure zone I may be.....