223, there isn’t a lot of selection for heavy bullets. This is why the 55 grain SP flat base bullets work well as subsonic round!īullet Trajectory- Distance is in Yards and drop is in inches. With the speed of sound being 1125 fps at 68 degrees F at sea level, and M193 running around 3100 fps, you can see that we have a long way to go to bring the velocity down. With noise comparable to a large air gun, the ASP gives the operator total stealth to achieve their objectives. You’ll have to not hear it to believe it. Having a high BC bullet at subsonic does not benefit the shooter at all. 223 subsonic round that will fully function a military M4 and/or commercial developed AR-15s. BC (ballistic coefficient) is for supersonic flight, and does not matter at subsonic speeds. You will need a fast twist barrel (1/7) to have any hopes of stabilization. The problem with subsonic loads in an AR is the gas port in the barrel. This allows the 55 grain SP flat base to be more stable and have the potential to be more accurate at subsonic speeds than a BTHP design. To load subsonic (under 1100 fps) you will be. To load subsonic (under 1100 fps) you will be hard pressed to get enough gas to. The 55 grain SP flat base is a much shorter bullet than a similar weight 55 V-max or BTHP design. In a given twist rate (like a 1:10″ or 1:9″ barrel twist) and slow subsonic speeds, a shorter, flat base bullet is more stable than a longer BTHP or VLD match bullet of the same weight. Bullet length is a major factor in how stable it is out of the muzzle. Why use a 55 grain SP (soft point) flat base, instead of a BTHP, VLD, polymer tip or match bullet? When shooting at subsonic speeds, bullet stability becomes a huge factor for the bullet to properly stabilize and for it to shoot well. If you are zero’d at 100 yards with normal full power supersonic 223 or 5.56 ammo, your point of impact (POI) with the subs will be about 6″-12″ low at 100 yards. This ammo will NOT cycle an AR-15!!! It will shoot fine out of an AR-15, but you will need to manually cycle the bolt. The 55 grain SP bullet is marginally stable in a 1:12″ twist barrel at subsonic speeds, and should not be shot in any slower twist rate. If you have a 1:12″ twist, you will need to check bullet stability first before shooting through a suppressor. Misc posts on forums regarding subsonic 223 loads (with some data on Hornet. Magtech 1000 Round Case 9MM Luger 115 Grain FMJAvailable in subsonic, +P. With a 55 gr bullet yields an expected rimfire-like velocity around 1000 fps. The story’s different at 500 yards, thanks to the longer and heavier bullet’s improved ballistic coefficient. This ammo will NOT cycle an AR-15!! This ammo is designed for 1:10″ twist or faster (1:9″, 1:8″. Winchester USA 223 REM 55gr FMJ 3240 FPS 600 Rds. This subsonic ammo is not designed for barrels longer than 24″. 308 bolt gun using Lead 160gr bullets and 6.5gr of W2fps, 1 inch 100yrds. I have loaded down 5.56 with 2400 to 1900ish and got the ar to cycle using a reduced recoil spring. This ammo is loaded to SUBSONIC speeds for barrels from 10″ to about 22″ barrels. I was reducing loads in a 270 win rifle once using 4227 and jacketed rounds. Once-fired LC brass, Hornady 55 grain SP (soft point) 1030 fps. 223 caliber firearms.Our top selling 223/5.56 SUBSONIC round (priced per 100 rounds). These relatively innocuous-sounding cartridges, with their low recoil and report, serve professionals with an alternative to much louder standard power rifle cartridges allowing faster follow up shots and better full auto accuracy with the added safety of not penetrating level 2 and higher armor worn by many law enforcement and military professionals.Ītomic’s Tactical Cycling Subsonic in 5.56x45mm produces similar energy and power as 9mm cartridges and delivers CQB accuracy from rifles with barrel twist rates of 1 in 7″ or faster. Unsuppressed, it is as quiet as most 22 LR and has minimal felt recoil. round-nose bullet that carries a muzzle velocity of 934 fps. Atomic’s Tactical Cycling Subsonic is unlike traditional high powered rifle ammunition. Mini-mags wont hurt your suppressor, but they wont stay subsonic so youll get a crack.
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