Looking for suggestions for sub sonic loads in 300 blackout

It comes down to what bullet and powder. I am loading A1680 and 220 grain bullets. Pretty easy to find a load. I am at altitude so Subsonic speed can differ from yours.

I ran 220 Out Law State with 10.0 grains of H110. But I want to try some Lil gun when I get back to shooting.

1680 is pretty much the standard for subs. I run 10.5-10.7 with 220s.

Thankyou

I use Lil' Gun at 8.7 grains with the 220SMK at 1030 FPS.

Thanks for that info. I wondered where to start. Do you use any filler?

No. Not needed with the 220gr bullet.

I'd start near 11 grains and work down.

AR or bolt gun?

Hornady has load data for subs.