Hutch,
Don't send the brass back,they sent you the right brass,but in an unformed state. The important dimension is the head dia.,and it is correct(it has to be a little smaller than the chamber,or it won't go in),the rim dia. is OK too.What you have to do now it to size it enough to chamber, and then fireform it.I don't know what dies you have avaliable,I can't make reccommendations of which to use.If you can wait until you get 6.5x70 dies,that would be easiest.Lubricate the cases and size them in the seating die,then run them through the sizing die.They should chamber,then,but if not don't despair.My late friend Gene Enterkin,wrapped such cases with one layer of bond paper(where marks showed the interference was)and drove them into the chamber,protected by a piece of wood,with a hammer.They were then driven out with a rod or dowel from the muzzle end. After this,they can be fireformed without problems.BTW,if there is not enough intereference after sizing to keep them from chambering(if they are tight but can be forced in),go ahead and fireform them.A funny thing about fireforming is that while filling in the loose places,it seems to lossen up the tight places, sometimes.I believe,though that the FL sizing will make the extra steps unnecessary. I hope this helps.
Mike
