Q Boombox In Subsonic 8.6 Blackout - Anyone With Accuracy Data?

[Milirad]

Does anyone have direct experience with or a reliable source for Boombox subsonic accuracy in 8.6 Blackout at a range of 300 yards +/-?

Subsonic accuracy of 1.5 MOA at 300 yards is my desired spec for reliable subsonic kills on coyote and hogs. I've been waiting for a few years for a subsonic AR 8.6/338 option that will repeatably meet this performance level with high quality factory ammo, preferably with a reasonably high BC bullet to buck wind. I was encouraged when Q announced that the Boombox would be 1 MOA or better with factory subsonic ammo, but I can't find any trusted range test results on the boombox with subsonic ammo.

Also, anyone have experience or reliable accuracy data on an AR that achieves this level of performance with factory 338 ARC 307 Sub-X?

 

[Milirad]

It doesn't look like anyone has subsonic Q Boombox accuracy data they want to share. How about you guys at Q - do you have some photos of 5 shot groups at 300 yards using factory ammo you can share with us?

 

[db2000]

8.6 Blackout???

 

[Milirad]

8.6 Blackout???

Yes, sorry for typo, will correct.

 

[db2000]

100 yd and 6.5tw Mos-Tek
Early in load development.
I realize it doesn’t answer your question re Q. These are supers.
Also, doesn’t make any sense to shoot subsonic to 300 yd for accuracy honestly. Maybe for fun but realistically no practical application sub.

 

[Milirad]

Nice. Which Seekins platform did you start with?

I've seen decent 8.6 Blk super groups, but not many good 8.6 Blk subsonic groups.

 

[db2000]

SP10

 

[JR1200W3]

Subsonic accuracy of 1.5 MOA at 300 yards is my desired spec

......., preferably with a reasonably high BC bullet to buck wind.

BCs don't work the same way in subsonic flight as they do in supersonic flight. They have much less affect. I would focus on a bullet that's made to expand at subsonic speeds over supersonic BC ratings.

 

[db2000]

^^^ what he said
A 300gr SMK would still be around 960-1000 fps w/ 840ish energy at 300 but it’s dropping almost 10 ft. A lot can happen with a potentially unstable bullet in that line of flight.