220 Berry's Bullets - 300 Blackout Subsonic Loads - 10.5" and 16" AR 's and Griffin Optimus 9

This is my first attempt at reloading subsonic 300 Blackout. I'm experienced in super-sonic ammunition. But since I'm now shooting suppressed, it is time to start experimenting with subsonic ammo.

There are some 50 yard groups at the end of the video.