300 AAC Blackout aka 300 Whisper
 

The max distance:

The Blackout has an effective range of 460 meters. From a 9 in (230 mm) barrel, the 125 gr BLK round has the same muzzle energy as the M855 from the M4, and 5 percent more energy at 440 meters.


Clyde

Thanks for the info, Chief. Hope you feel better soon.