I’ve always been a fan of 300 Blackout, mainly because it’s a ballistic geek’s delight. The ability to swap between supersonic and subsonic performance simply by changing magazines the availability of loads ranging from 110-grain rockets to 240-grain bricks is compelling features. That’s a lot of performance variance out of the same rifle or pistol. Adding a suppressor makes the 300 Blackout shine. The suppressed supersonic loads are muted, at least for the muzzle blast components of noise, and the subsonic loads are shockingly quiet when fired through a silencer. The sound of “thud” comes to mind when the noise of those heavy subsonic bullets hitting the backstop dwarfs the volume of the shot itself.
There have been two big problems with 300 Blackout that have inhibited wider adoption, at least in my opinion. First, establishing simple aim points for such widely varying ammunition types through a standard scope requires math and memorizing custom hold-overs. Second, while it’s easy to make expanding supersonic ammunition for hunting or defensive use, subsonic loads have been a challenge. The standard 220-grain load will tumble when it hits an organic target because of its inherent instability, but up until now, a more traditional expanding bullet has been hard to find.