If you own a sound suppressor for your firearm, you know what a challenge it can be to find subsonic ammunition that functions properly while still maintaining subsonic velocities. Why not look to a suppressor manufacturer for the perfect ammunition?
Gemtech offers .22 LR and .300 AAC Blackout rounds custom-tuned for suppressed firearms. The company claims the .22 LR offering will function in suppressed handguns and rifles, and the .300 BLK functions in 8-inch SBRs through full-length bolt-action rifle barrels. Both offerings are designed to operate subsonically, with the .300 BLK claiming a velocity of 1,050 fps and the .22 LR a velocity of 1,020 fps.
Should you wish to load your own subsonic ammunition, Gemtech offers cleaned and de-primed brass for .300 BLK. There are "sample packs" of both the ammunition and the cleaned brass available for those looking to try either the ammunition or the reloading supplies.