In that case, we might end up seeing modified PMags with the ribs slightly honed down, and longer OAL's eventually. This seems to be a dangerous compromise made in order to be able to claim that this round will "work with any /all std. 100 freebore, accuracy may not be great, unless longer OALs are used. I have also heard that the suggested OAL results in a huge jump to the lands, and given the. I see little use for the 1:10 since this cartridge almost seems silly if you are not going to use it with subsonic ammo. Originally Posted By: HTR707Most barrels will use the 1:8 twist, and especially if you shoot the 220 SMK subsonic load. I started this thread in an effort to expedite the development of this cartridge. I am not affiliated in any way with AAC or the Freedom Group. Other companies developing products for the 300 BLK can be found here: Noveske is developing barrel assemblies for 300 BLK. 073 (.093 was required when using subsonics) Wilson Combat is using the following gas port sizes:ġ1" pistol gas. Gas port diameters remain undisclosed and have been deemed proprietary corporate information by AAC / Robert Silvers. (If using an AR.)ĪAC is currently using a pistol length gas system in their 9" barrels and a carbine length one in 16". When posting please be sure to include barrel length, twist rate, chamber type and gas tube position. Please post both supersonic and subsonic load data. The max case length is 1.368", chamber is 1.378 to where the case mouth would be. The headspace is exactly the same as 221 Fireball, the chamber is exactly the same as the 221 Fireball except the neck is. (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.
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