If you are looking for a .308 caliber rifle bullet for subsonic use, you might be interested in the new projectile from Lehigh Defense. The new bullet is a 176-grain projectile that is specifically designed for subsonic use when loaded in a .308 Win and 300 BLK cartridges.
From Lehigh Defense:
Lehigh Defense Offers Multiple Chances to Win Special Edition “300 Game Changer†Promotional Packages
Lehigh Defense, the premium ammunition and bullet manufacturer known for their innovative ammo and bullets, is working with top industry bloggers to offer readers multiple chances to win special edition “300 Game Changer†NRA promotional bullet and ammunition packages.