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On about my 4th batch of 5.56. Did the first couple of hundred with a Lyman die set. My Ruger AR did not like them. Got a case gauge and found about half would not seat. Changed to the RCBS AR SB die set #11107 and found they came out much better. Had a few that still would not seat in gauge and it was dings in the rim. I chucked those few in a can for when I'm really bored. Got a collet puller for the couple of hundred that didn't pass muster from the first batch and it worked very nicely in the single stage.
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