{"id":7225,"date":"2025-06-25T18:26:33","date_gmt":"2025-06-25T18:26:33","guid":{"rendered":"https:\/\/www.targetbarn.com\/broad-side\/?p=7225"},"modified":"2025-09-24T18:38:12","modified_gmt":"2025-09-24T18:38:12","slug":"quietest-300-blackout-ammo","status":"publish","type":"post","link":"https:\/\/www.targetbarn.com\/broad-side\/quietest-300-blackout-ammo\/","title":{"rendered":"Quietest .300 Blackout Ammo: Decibel Test"},"content":{"rendered":"

We’re on the hunt for the quietest .300 Blackout ammo to use with a suppressor!<\/p>\n

If you’re trying to find quietest ammo for your .300 BLK build, we’re here to help. We decibel test nine different .300 BLK loads at the range using a professional decibel reader in search of the quietest round!<\/p>\n

Decibel Testing .300 Blackout Ammo<\/h2>\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t
Cartridge<\/th>5-Shot Average Decibels (dBZ)<\/th>Advertised Muzzle Velocity (fps)<\/th>\n<\/tr>\n<\/thead>\n
Black Hills Subsonic 220gr. OTM<\/td>133.26<\/td>1000<\/td>\n<\/tr>\n
Federal American Eagle 220gr. OTM<\/a><\/td>135.22<\/td>1000<\/td>\n<\/tr>\n
Fiocchi Subsonic 220gr. HPBT MatchKing<\/td>133.5<\/td>1020<\/td>\n<\/tr>\n
Hornady Black 208gr. A-MAX<\/a><\/td>132.48<\/td>1020<\/td>\n<\/tr>\n
Hornady 208gr. BTHP<\/td>133.9<\/td><\/td>\n<\/tr>\n
Hornady Subsonic 190gr. SUB-X<\/a><\/td>134.62<\/td>1050<\/td>\n<\/tr>\n
Super Vel Hush Puppy 200gr. FMJ<\/td>134.62<\/td>1050<\/td>\n<\/tr>\n
Underwood Subsonic 220gr. HPBT<\/td>134.22<\/td>1030<\/td>\n<\/tr>\n
Winchester Subsonic 200gr. Open Tip<\/a><\/td>135.76<\/td>1060<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n

We rented a Larson Davis Spartan 821<\/a> Noise Sound Level Meter for our testing, and set it up using a .25″ microphone set up one meter to the left of the shooter.<\/p>\n

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We used 3GunKenzie<\/a>‘s custom .300 Blackout setup as our test gun:<\/p>\n