The blackout is the perfect subsonic build or buy. IMO 233 is wasted attempt and will lead to frustration if you are after quietness. You have to stay at 1050 or below on mv.
Subsonic shine with heavy bullets due to need to keep mv at 1050.
In 30 caliber you will need 1-8 or 1-7 twist.
Lot of specialty bullets for subsonic in 30 caliber, none in 223.
I have 10 and 16 inch barrels and they are spooky quiet in blackout. Nothing else comes close. With suppressor volume is key to quietness. I am using liberty victory magnum which is titanium and larger.
Buy a rem 7 in whisper/blackout
I am running 125 btips at 2450 in same barrels.
Subsonic shine with heavy bullets due to need to keep mv at 1050.
In 30 caliber you will need 1-8 or 1-7 twist.
Lot of specialty bullets for subsonic in 30 caliber, none in 223.
I have 10 and 16 inch barrels and they are spooky quiet in blackout. Nothing else comes close. With suppressor volume is key to quietness. I am using liberty victory magnum which is titanium and larger.
Buy a rem 7 in whisper/blackout
I am running 125 btips at 2450 in same barrels.