(Check with the manufacture for compatibility and always have the chamber reamed when in doubt.)Ĭhamber details as posted on another forum: The 300 BLK has a larger throat and therfore 300 BLK factory loading could cause excess pressure in 300 Whisper (R) / 300 Fireball chambers. 300 BLK cartridges and 300-221 Rem Fireball cartridges should be thought of in the same way. 5.56x45mm NATO Brass can be used as the parent brass and then resized / trimmed. The more people that ask for it the more likely they will produce it: (AAC has stated on other forums that they would provide the cartridge drawings to them if asked.) It would be awesome to see Redding pickup this cartridge as well. Set of Full Length Sizing Die and Ultra Micrometer Seating Die, 300 BLK, Part #U04453.Set of Full Length Sizing Die and Standard Seating Die, 300 BLK, Part #004453.Ultra Micrometer Seating Die only, 300 BLK, Part #U00099.Standard Seating Die only, 300 BLK, Part #006205.Full Length Sizing Die only, 300 BLK, Part # 005545.Reloading Dies are available from Forster Remington AccuTip 125 grain, OAL: 2.085.Nosler Ballistic Tip 125 grain, OAL: 2.085.Here are some suggested OAL for popular bullets: With 300 BLK ammo, the contact is on the bullet.īecause the bullet is a larger diameter, the rib will push the cartridges out of alignment,Īnd can lead to binding potentially resulting in Failures to Feed.įor this reason, it is important to load ammunition so that the contact point with the magazine rib is on the bullet ogive in an area of about 0.250 inch diameter. Sierra 220 MK loaded to 2.089 OAL (this length is optimal for reliable feeding from USGI magazines)Įxisting AR magazines have a rib which normally contacts the 5.56mm case-neck.Look for a load which results in a cyclic rate of 700 rpm or more.ĪA1680 is recommended because its bulk density matches the case capacity and it will generate enough gas pressure to cycle the weapon. These loads pay no attention to automatic rifle function and should not be used. Or for ARs by people not aware of the magazine limitations. Many existing loads were developed for Thompson Center® single-shot pistols, Recommended powder for most supersonic loads is Hodgdon H110.įor subsonic, there are special requirements and nearly all published loads are non-optimal for the 300 BLK upper. If you load your own ammo, pay special attention to all of the normal safety practices. Listed Below is the suggested loading info released by AAC. Since the 300 AAC BLACKOUT is an official SAAMI spec cartridge now, hopefully more innovation in this platform will come about. This looks like it will be a nice solution in many areas. I have been intrigued by the new incarnation of the SSK "300 Whisper®" concept introduced this month by AAC.
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