Quarterbore's Forums - converting .223 brass to 300 AAC

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chiao123

08-19-2011 08:53 AM

converting .223 brass to 300 AAC

What is the exact length .223 brass has to be cut down before i put them thru the dies for 300 blackout for .223 to 300 aac conversion? On ammoguide.com they list 300 blackout case 1.368.

http://ammoguide.com/?catid=808

thehouseproduct

08-19-2011 12:48 PM

A lot of us cut it long, form it and then do final trim as 300BLK.

Dacapster

08-19-2011 11:28 PM

Yes, form and trim in a whisper trim die to @ 1.4 then trim to final length.

Ned christiansen

08-20-2011 03:30 PM

I have found the amount of length growth in forming the neck is pretty predictable--- about .009. I cut them off .010 short and have not had to re-trim after sizing.

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