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. Having a high BC bullet at subsonic does not benefit the shooter at all. What is subsonic ammo Well, in short, subsonic ammo doesnt break the sound barrier. Bulletproof Workshop Ep 036 with Ernest Langdon - Watch Now ARCHIVED THREAD - Subsonic 5.56 load data needed with Unique and 75 grain Hornady. Another reason you may select supersonic over subsonic is range. Unless they have enough blowback, AR-15s typically dont work like they should. 223 because it has too much energy and theyre fed up with the resulting damage to stock equipment and buildings (including their houses). 223 round - varmint shooting in California. 223 and 5.56 calibers subsonic ammunition simply does not have enough pressure to make the AR-15 run correctly. Actually I can think of one somewhat obscure application for a subsonic. BC (ballistic coefficient) is for supersonic flight, and does not matter at subsonic speeds. Revisiting earlier statements about subsonic ammo and. 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. The 55 grain SP flat base is a much shorter bullet than a similar weight 55 V-max or BTHP design. Penetrator 223 Remington ammunition and 5.56x45 NATO rounds are among the popular cartridges for American civilian shooters. 223 While 5.56 NATO and 223 Remington are used interchangeably, they are not the same round. ![]() 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. What is the effective range of a 300 blackout subsonic. 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. ![]() This ammo will NOT cycle an AR-15!! This ammo is designed for 1:10″ twist or faster (1:9″, 1:8″. ![]() This subsonic ammo is not designed for barrels longer than 24″. This ammo is loaded to SUBSONIC speeds for barrels from 10″ to about 22″ barrels. Once-fired LC brass, Hornady 55 grain SP (soft point) 1030 fps. Our top selling 223/5.56 SUBSONIC round (priced per 100 rounds).
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