TOO BAD I CAN'T EMBED VIDEOS......? but enjoy them if you want to follow the Youtube links
I finally received powder (I've had on order forever...THANKS Obama) slow enough to load up some 220 gr SMK subsonic loads in the 300 Blackout.
I build (assembled, pieced together, hobbled...what ever) a new SBR specifically to be used with a AAC Cyclone 7.62 suppressor. (if interested details on rifle below)
The issue is the 300 Blackout brass. I have some actual 300 Blackout brass, but I don't want to waste/damage it on load development. The only solution (cause there isn't any to be found....THANKS again Obama) is to convert .223/5.56 brass to 300 Blackout brass.
I put together a short video showing the steps to make the 300 Blackout brass and the simple reloading steps for making 220 gr SMK 300 Blackout rounds. I know there are MANY other steps, tricks, blah blah blah....but this was meant to be an under 2 minute simple video.
I will tell you that the tricky part it to get the CL and OAL to meet the specification of the rifle chamber so the bolt will close. Since ever chamber is slightly different I had to destroy 1/2 dozen cases and bullets to get it perfect for my rifle. 220 gr bullets take up a lot of case capacity.
Basic conversion to 300 Blackout video and simple reloading steps for the 300 Blackout.
http://www.youtube.com/watch?v=LFJzfsuQeRY
The shakedown run had no issues and ALL subsonic loads cycled the bolt, with suppressor. No FTF or FTE and they held the bolt open on last round. The subsonic load DID NOT cycle the bolt without the suppressor (expected this). The best part is that there was no POI shift with/without suppressor and removing/reinstalling suppressor.
300 Blackout test video. Straight video with no alterations shot with iPhone 5. (sorry not the best but will give you an idea of sound at muzzle)
Load used: (specific to my rifle use at your own risk)
10.7 gr 5744
220 gr SMK
1.3520 CL
2.1165 OAL
CCI #41
*load is remarkable quiet (no hearing protection needed) and extremely accurate. First shot is slightly louder that 2nd..3rd...
http://www.youtube.com/watch?v=kZsV2RxLbuA
Rifle used: (this was build from the ground up, by me to spec)
Federal Requirements: (2 NFA tax stamps)
GTO Billet lower (registered)
Spike's upper
DD Omega 7" lite rail
8.2" Noveske barrel 300 BLK
Timney 3.5 lb trigger
YM M-16 BCG
Bravo CH
Bravo buffer/tube/spring
Assorted Magpul
Troy BUIS
Bobro QD mount
Trijicon AccuPoint 1-4 30mm
AAC Cyclone 7.62 suppressor (registered)
Next up I tested 62 gr SS109 5.56 and 60 gr Aguila SSS subsonic 22lr through another AR-15 SBR with a AAC Ranger 2 5.56 suppressor. (rifle specs listed below if your're interested. Again, I am looking to see if there is any POI shift and what the accuracy is w/without the suppressor. No issues with the rifle's functioning with either load.
The video is not altered and was shot with iPhone5 (again, sorry not the best platform for shooting this type of video....but you get the idea)
5.56 test (quiet enough to shoot without hearing protection)
http://www.youtube.com/watch?v=uPRaXoWDad8
22lr test (you could shoot this indoors with no hearing protection)
http://www.youtube.com/watch?v=jORxOkjCM4s
Rifle used: (this was build from the ground up, by me to spec)
Federal Requirements: (2 NFA tax stamps)
GTO Billet lower (registered)
Vltor VLS upper
10.5" Noveske barrel 5.56
Timney 3.5 lb trigger
Bravo BCG
Bravo CH
Bravo buffer/tube/spring
Assorted Magpul
Troy BUIS
LaRue QD mount
Trijicon ACOG 1.6
AAC Ranger 2 5.56 suppressor (registered)