Working at shorter ranges, say under 500 yards, Lessard says a 300 BLK setup will give you what you need in a package much smaller and lighter than a .308 Win rifle; there’s more factory-loaded subsonic ammo available in 300 BLK than in .308 Win; and 300 BLK has more consistent velocity because the case fill is close to 100 percent. Despite all the benefits that come with a bolt gun, when it comes to this caliber, there’s one clear reason to build a bolt gun versus a semi-auto — because you just want a 300 BLK bolty. While the Dagger might not be the most practical gun on the market, a lot of thought went into the gun’s design.