STEADFAST 300 BLK 125gr HP SMK
The STEADFAST 300 BLK 125gr HP SMK was originally based on the .221 Fireball case necked up to .30 caliber. However, reloaders have found the .223 Remington or 5.56×45mm NATO works well when shortened and resized to .30 caliber. Firing in the .300 Whisper chamber results in a slightly sharper shoulder. Magnum pistol powders such as H110 work well for supersonic loads. Sierra 240 grain (16 g) jacketed bullets work well if the barrel has a 1:8 twist. Barrels with a 1:10 twist will stabilize 220 grain (14 g) bullets at subsonic speeds. 125 grain (8 g) bullets will reach 2,400 ft/s (730 m/s).
300 Blackout vs. 308
The 300BLK has a trick up its sleeve, however. One of the biggest draws of the 300 BLK is its performance with subsonic ammunition. With the increased popularity of suppressors, the use of subsonic ammo has surged. Subsonic ammo doesn’t generate the “crack” of a bullet breaking the sound barrier. So, the overall noise level of firing is noticeably less than with supersonic ammo, especially when firing with a suppressor. Subsonic ammo may only have six to 10 grains of powder. Combine a significantly reduced powder charge with a bullet that never breaks the sound barrier, and a suppressed 300 BLK is substantially quieter than a hidden 308. While the subsonic loadings generate much less velocity, they typically have bullets weighing more than 190 grains. Advantage goes to the 300BLK here.
The 300 BLK contains a much smaller powder charge. Most 110 to 150-grain bullets typically loaded into supersonic 300 BLK ammo receive around 20 grains of powder. A 110-grain bullet leaves the muzzle of a 16-inch barrel at approximately 2,250 feet per second. Compare those numbers with 308 ballistics, and you can start to understand the differences between the two cartridges.
This Bulk Pack may contain BLEMS. As a result, some rounds may have cosmetic defects such as surface scratches, dings, or tarnish. These cosmetic defects will not inhibit performance.
STEADFAST 300 BLK 125gr HP SMK features
|Dimensions||5 × 5 × 3 in|
|ammo type||Defense/Hunting, Target/Practice|
|# of rounds||150|