Very interesting to hear they are still using the old Olin alloy, wonder what the heat treat spec is...

Since it relates, a side note to Federal for you Texas10.
AT least in the 308/7.62 cases, and specifically the FGMM. One of the "tricks" they have employed for some time to help with their well earn rep for accuracy is very soft heat treat specs. A softer case will obturate much faster and seal the chamber more rapidly. The downside, as it relates to the reloader, is they have been known to get a wee carried away in how far down the case the softness is. The heads can be dangerously soft. Don't think I posted it here, but when fooling with the Pressure trace system we've had lighter loads (50-55,000) that had the heads grow my shocking amounts. Have grown extractor grooves by a tenth!!
Was firing in a hawkeye and XL7. The Ruger dealt with it just fine, but the X7 blew the snot out of the extractor.


I see that one got snuck in before I posted.
That is incorrect, at least on "as-built". You can skin a cat several ways. Here is the article I referenced earlier.
http://www.accurateshooter.com/techn...rtridge-brass/