One of the most popular and effective loads is 300 blackout subsonic. Therefore, subsonic loads are designed to strike the right balance of velocity and bullet weight. To do that, ammo makers design the round to travel at velocities below the speed of sound, which creates another problem altogether.
#Subsonic 223 rounds crack
The goal when designing a subsonic round is to reduce the noise of the initial crack caused by expelling gases. Not to mention projectile stability and weapon reliability.The benefit of using subsonic ammo is that it's quieter than standard ammunition and makes suppressed fire even more effective, but going subsonic poses a number of challenges for manufacturers. What would be the point of carrying a rifle and using 223 at that point?. Using heavier rounds, you could get the effectiveness at range out to about 60-70 yds.īut a 55gr going slight more than 1000 fps? A. At 50 yds, the round would poke a small hole. Shooting into various ******* ballistic testing devices, you could clearly see much more damage at 30yds than at 50yds. In a 10" barrel with NATO 556 55gr, we were getting just a bit over 2200fps at the muzzle. I've done a fair amount of shade tree ballistic testing with shorter barrels, lower velocities, twist rates, and various weight projectiles up to 75gr.īottom line is that heavier rounds can only compensate for so much, and running the velocity down to 1000 fps or so, even with a 75gr round, makes for a much less lethal round. 223 relies on muzzle velocity for terminal ballistics. 223 subsonic has 20% more velocity at 150 yards than a. and only a powder-puff impact with 57 ft. 223 with a 75 grain boat-tail subsonic will still hit the 150-yard target at 960 f.p.s., while the. (see the chart from the Federal ammunition company at this link: ). 22LR subsonic round-nose will hit at 930 f.p.s. At 100 yards the difference is small (about 6%), but if you take a 150 yard shot, the. 223 bullet will have a much better ballistic coefficient, and thus will retain its velocity better. (180 ft/lbs versus 130 ft/lbs in example above).Īlso, the sharply-pointed. 223 round is nearly twice as massive (weight), and this will strike with a lot more kinetic energy, even at the exact same velocity. 223 bullet moving at the same muzzle velocity. (just barely still subsonic) is NOT like a 75-grain boat-tail. 22LR bullet initially moving at 1040 f.p.s.
After that, if you miss, you have the choice to either slink away quietly or cock your gun and hope the bad guys didn't hear you do that or see your arm movement. For tactical applications, against bad guys with their own guns, you'd just have to accept that you only get one fully suppressed subsonic shot from deep concealment. For plinking at the range, it's no big deal to cock the rifle in between shots. For most hunting or pest control applications, you only need one shot most of the time. They probably will not cycle the action as a semi-auto, but if you need more than one quiet shot, you can rack the charging handle manually. But don't pretty much all AR pattern rifles made in the last 15 years come with 1:9 or faster twist? And even the bolt-action guns tend to be 1:10, which is probably fast enough to stabilize up to 62 grain subsonics, and maybe the 75 or 77-grain boat-tails too. The heavier bullet loads, combined with slower speeds (the bullet spins at lower RPM's) means you need a fast twist barrel. 38 special standard-pressure load (either 158 grain or 125 grain). The heavier-bullet loadings like the 75-grainers will generate 200 foot-pounds of energy, making them in the same power class as a. bullet at 1010 fps) Allegiance Ammunition (100 grain at 975 fps) Custom Reloads of Dallas (55 gr.
Several smaller ammo companies load subsonic rounds for the. 223 / 5.56mm ammo through their AR's and their bolt-action weapons that serve has host guns for their 5.56mm suppressors? Why don't people seem to be interested in shooting SUBSONIC.
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