Cartridges built from the ground up for subsonic shooting have exploded in popularity over the last several years. The 300 Blackout is the obvious headline act, purpose-designed to run quiet loads through an AR platform without any of the usual compromises. Walk into any gun shop, and you’ll hear plenty of talk about Blackout, but what a lot of shooters don’t realize is that the rifle already sitting in their safe can join the party too. A .308, whether it’s a bolt gun or a more modern build, can be loaded down to subsonic velocities and run quiet behind a suppressor.