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6,666 Posts
I used to fireform 8x57 before I scored some 7.7 brass. Got told it was bad for the throat. Never scared me though.
http://www.surplusrifleforum.com/viewtopic.php?f=78&t=91276
http://www.surplusrifleforum.com/viewtopic.php?f=78&t=91276