1/29/2024 0 Comments Subsonic rounds 300 blackout![]() ![]() Our friendly experienced staff can help you directly. It's not unlike the situation with the old Hornady Light Magnum loads-they had a longer pressure curve that resulted in higher port pressures than regular ammo, hence the recommendation to refrain from using them in semi-auto guns. Buy Ammunition > Centrefire > 300 Blackout - Gun City are the leading firearms experts in New Zealand. 308 with a port large enough to cycle the action with subsonic loads, a supersonic load would be so over gassed that I imagine it would wreck the gun (if not the shooter as well!). However, if you ran a pistol-length gas system on a. This purpose excludes taking down big game effectively and ethically. This avoids the supersonic shockwave or 'crack' of a supersonic bullet, which, particularly for suppressed firearms, influences the loudness of the shot. A pistol-length gas system is the standard length for Blackout, and it works, again, because of the relatively small case capacity/bore diameter ratio of the Blackout. Subsonic 300 Blackout rounds perform extremely well for their intended purpose. Subsonic ammunitions are ammunitions designed to operate at velocities below the speed of sound, which at standard conditions is 340.29 m/s (1,116.4 ft/s) or Mach 1. So, while there is a stark contrast in bullet size between the two cartridges in the photo, thats not. Another factor is the location of the gas port. 300 Blackout cartridge with a 220gr subsonic FMJ bullet. Compare that with a 308 Win subsonic powder charge that's about 20% of a supersonic charge there's simply not enough gas volume to cycle a 308 action. A subsonic powder charge in Blackout has more than 50% the weight of a supersonic powder charge, so the gas volume generated, though smaller, is still within the range necessary to cycle the action. First, along the lines of what smustian wrote, the ratio of case capacity to bore diameter is the largest factor. The difference with Discreet Ballistics is that we know that. My layman's guess is that it's a combination of two factors. I briefly tried shooting hogs with heavy subsonic bullets, but the rainbow.
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