Thread: 308 Subsonic

ive been trying trailboss and 150 g cast, 8.5 grains gives 970 fps but only 2inch groups at 50 metres. Still trying but waiting for calm days

Excuse my lack of understanding, but why use cast bullets?

Originally Posted by HOWA308

Excuse my lack of understanding, but why use cast bullets?

To try and get expansion.

Originally Posted by HOWA308

Excuse my lack of understanding, but why use cast bullets?

Cheap and work well at sub sonic speeds.

In my experience no normal hunting .308 bullet will expand at sub sonic speeds. They usually just punch a hole, if that is through the brain or spine the result is the same anyway.

Also you might find long pointy bullets don't stabilise out of a slow twist .308 barrel. This means any heavy long range low drag projectiles. Not sure what the limit for 208 gain A max projectiles is but less than 1:10 might be too slow and worse at sub sonic velocities. That's why 300AAC generally has a 1:8 or 1:7 twist barrel.