Comments on: SHOT Show: New 125gr Flat-Based .30-Cal MatchKing from Sierra https://bulletin.accurateshooter.com/2012/01/shot-show-new-125gr-flat-based-30-cal-matchking-from-sierra/ from AccurateShooter.com Mon, 01 Jun 2026 18:40:32 +0000 hourly 1 https://wordpress.org/?v=4.1.26 By: RB https://bulletin.accurateshooter.com/2012/01/shot-show-new-125gr-flat-based-30-cal-matchking-from-sierra/comment-page-1/#comment-42175 Sat, 04 May 2013 04:22:54 +0000 http://bulletin.accurateshooter.com/?p=33875#comment-42175 I sure would like to see some 300 AAC load data for this bullet. Can’t seem to find the load data anywhere.

Using H110 powder.

]]> By: Jed https://bulletin.accurateshooter.com/2012/01/shot-show-new-125gr-flat-based-30-cal-matchking-from-sierra/comment-page-1/#comment-27338 Fri, 20 Jan 2012 20:44:09 +0000 http://bulletin.accurateshooter.com/?p=33875#comment-27338 Actually, from what I have read, IT IS based on cut down .223 brass rather than .221 brass in order to help all the reloaders having problems with making .300 Whisper brass from .223 and having to turn necks. The .300 Black chamber drawings took the thicker mid area brass of the .223 into consideration for handloaders to be able to cut and run .223 brass in a .300 Black die and then load and shoot with no need to turn necks and thereby winning over .300 whisper “high volume” shooting fans to the AAC .300 Blackout camp since the Blackout was more reloader friendly for those with boat loads of .223 brass.

]]> By: Steve https://bulletin.accurateshooter.com/2012/01/shot-show-new-125gr-flat-based-30-cal-matchking-from-sierra/comment-page-1/#comment-27222 Thu, 19 Jan 2012 13:38:42 +0000 http://bulletin.accurateshooter.com/?p=33875#comment-27222 Just a side note…The BLK is NOT based on the .223 Rem. It is based on 221 Fireball.

]]>