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This is from RCBS on this subect:
Reply from RCBS my thought would be to not use the brass for reloading. My
reasoning is that most often the rounds were fired in a H&K semi-auto or
full-auto firearm (or para-military look alike). The flutes in the
chamber are to ease the extraction forces of the hot case and lessen how
tight it adheres to the chamber wall, that puts stress on the brass at
each flute. That sort of stress is not seen in a normal chamber since
they don't have the flutes and to what extent that will effect case
performance and longevity are an unknown.
Case preparation will take time in that each case will need to be sized,
trimmed to length, primer pocket swaged (most likely with military
cases) and then fireformed to remove the flute dents. The amount of
reloads available after that is an unknown and if a case fails it would
most likely not be at the normal web-failure point, but rather at a
flute. Case failures and escaping gas at 50,000 psi is not a good thing
to have happen.
My suggestion would be to take a hammer, crush each case and sell as
scrap brass. Take that money and buy new 308 Winchester brass.
Shoot Straight!
Coy Getman
2299 Snake River Ave.
Lewiston, ID 83501
Sr. Technical Coordinator
(866) 286-7436 ext 5351
I would suggest that if the brass was Mil surplus you might get away with a couple three reloads if commercial less. And the failure would not only be hard on your chamber but could be dangerous.