300 ULTRA sizing problem

elkaholic

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Joined
Dec 4, 2008
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hauser, id.
Does anyone out there have problems with sizing down there 300 ultras??
I'v tried RCBS, hornady, and currently Forster dies all with the same results. I get about two or three firings and have extraction problems. (not over loads) My chamber is .550 at the web and none of the above mentioned dies will size below that spec. New brass is around .545 and usually measures around .548-.549 after first firing.......Rich
 
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