SHOT Show: New 125gr Flat-Based .30-Cal MatchKing from Sierra
Sierra Bullets rolled out few new products for SHOT Show 2012. The one new bullet is a .30-caliber flat-based bullet, the 125gr OTM (open-tip match HP) MatchKing, item #2121. This unique flat-based bullet was designed in conjunction with AAC (Advanced Armament Corporation) and Remington for the new .300 AAC Blackout (BLK) cartridge, a relatively small cartridge based on the .223 Rem necked up to .30 caliber. The bullet length is tailored to correctly fit and feed from AR-15 platform magazines. The relatively light weight of Sierra’s new 125gr MK allows it to reach fairly impressive velocities even with a modest powder charge. Of course it can also be used in subsonic mode, running at sub-Mach velocities. However, it is more typical for .300 BLK shooters to run a heavier bullet, such as the 240gr SMK, for subsonic applications (the heavier projectile delivers much more downrange energy at subsonic MVs).
The projectile’s Open Tip is pinched for greater uniformity in the same manner as Sierra’s Palma Competition bullets. The G1 BC is surprisingly high for a relatively short, flat-based bullet: 0.310 (below 1600 fps), 0.330 (1,600-2,000 fps), 0.338 (2000 – 2650 fps), and 0.349 (above 2650 fps). Though it will perform well at low velocities in the .300 BLK, this bullet can handle the higher velocities produced by common .30 cal mid-sized cartridges, such as the .30-30.
The new 125gr Matchking is now being loaded in factory ammo, including Remington’s Premier Match, which retails for $34.00 for a 20rd box. These 125gr bullets are available now from MidwayUSA for $34.99 per hundred.
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Tags: .300 AAC Blackout, .300 Whisper, 30-223, Sierra, SMK, Subsonic
Just a side note…The BLK is NOT based on the .223 Rem. It is based on 221 Fireball.
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.
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.