I’d arrived with a BLK barrel, which we used to create an upper receiver. A month later, we stood in the back room of their factory while scratching our heads. Although intrigued, they had no real experience with it – which led to an experiment. As OIC of a government firearms unit and driven primarily by tactical interest, I mentioned this caliber to some contacts at a major AR manufacturer. AR-15 sales had gone soft after the unprecedented 2013 surge. Through 16-inch barrels, performance is similar to the 7.62x39 Russian without the need for curved AK-type magazines. In fact, it was also designed to provide reliable AR function with supersonic loads. 300 Blackout has caught on to the point where numerous ammo options exist. This situation is now less of an issue since the. Bottom line: Commercial Whisper loads should safely fire in BLK chambers cut to SAAMI drawings, whereas the reverse could cause problems. Some confusion has since arisen concerning interchangeability of these cartridges, exacerbated by “Whisper” branded firearms and ammunition. Dimensions vary only slightly, in a manner similar to 5.56/.223, primarily through the BLK’s slightly-lengthened chamber leade. They also submitted it for SAAMI acceptance, resulting in the.
#Lehigh subsonic bullet crack#
With the nasty supersonic crack eliminated, the result was a very quiet load! And, because the Whisper’s case-head was identical to a 5.56mm/.223 Remington, conversion was as simple as a different barrel.Īround 2010, based on military interest, Advanced Armament Corporation (AAC) tweaked the Whisper for improved M-4 function. Sufficient operating pressures could thus be generated using the small propellant charges needed to keep velocities below the speed of sound. 30-caiber cartridge provided enough room in standard M-16 magazines to accommodate ultra-long, heavy bullets of 200 grains or more. The aptly named Whisper offered reliable AR function with subsonic loads for maximum suppressor effectiveness.įormed from relatively short. However, some confusion still exists regarding their subtle differences. 300 Whisper that appeared during the early 1990s. 300 Blackout is an evolution of the similar. 300 Blackout Subsonic load had chalked up a double thanks to minimal disturbance of the area. Within moments, Hornady’s new, ultraquiet.
This one was farther at 120 yards, so I held high in its chest. A bit more scanning revealed it, seemingly confused by its napping partner. I thought I’d caught sight of a second coyote during the transition from bino to the night-scope and, sure enough, I had. The coyote was immediately tumbled by a heavy subsonic bullet as brass whizzed around the blind’s interior. As soon as the illuminated crosshairs found its mark, I squeezed off a quiet shot. While panning toward the bait, it suddenly appeared in the scope only feet from the coyote buffet. Powering up its night scope, I slipped the rifle through the opening and tried to reacquire the coyote. I killed the hissing heater, quietly opened a window and reached for the suppressed modern sporting rifle. Silhouetted against a snowy backdrop, it was trotting toward a bait pile 80 yards from the blind. Inside my drafty blind the propane heater was struggling, and the dead-quiet night had become a tiresome grind – until a coyote materialized in my bino. January’s feeble sun had given way to dim moonlight. Despite a broadside shoulder hit from 100 yards, an exit on the spotted cat (R) was limited to several tiny jacket fragments. 300 Blackout SUB-X accounted for these bobcats taken only minutes apart after sunset.
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