The Whisper was based on the 221 Fireball case, but most describe the 300 BLK as being a 223 case, necked up to .308 and trimmed. It’s short and stubby, with a bullet that seems too big for the ...

This new cartridge is designed to excel in both subsonic and supersonic performance, positioning itself as a direct competitor to the well-established 300 Blackout. During a recent episode of the ...