300 Blackout CB loads to function SBR

[TAC14]

Have a "no registration" 300 BO SBR upper coming from Tactical Solutions.

Want to shoot it with my can but not hand operate it.

Appreciate suggestions for subsonic CB loads that will function it.

https://www.tacticalsol.com/tsar/300-upper

[bruce drake]

Does that 5 inch shroud double as a golf-ball launcher when you remove the can and use a blank cartridge?

But seriously, with a pistol-length gas tube with the 11" barrel, you aren't exploring new territory with subsonic bullets in a can.

https://load-data.nosler.com/load-da...-aac-blackout/

[Grmps]

choose you boolit, powder and the highest subsonic speed and ladder test backwards until the slide doesn't function

[TAC14]

Thanks, when it arrives, I'll be loading some up.

[Handloader109]

If you have to buy powder just get some cfe blackout. But seriously, I would not touch that thing with a ten foot pole unless I put on a pistol. With short barrel, shroud wouldn't pass muster to be legal. And totally defeats the purpose of being short. Just to save a few dollars and a few months you are paying three times what a sbr length receiver costs...