There is a big difference between high-speed, supersonic bullets, and low-speed, subsonic bullets. Regardless of what they hit on the way through, they continued on a straight and very deep path. The African hunters of old used solid bullets with noses shaped like a hemisphere (ball end), and these were the most stable of all the possible shapes. Flat-nosed bullets with flat bases (a true cylinder) are most effective. 223 THAT WILL BE EFFECTIVE ON LIVE ANIMALS, ANOTHER OPTION IS TO CAST AND LOAD YOUR OWN BULLETS. 223 round if you are shooting a bolt-action or another manually cycled weapon – like the newer pump and bolt-action AR15 uppers that are coming out on the market lately. Don’t waste your money on a self-cycling. Since they use less than 5 grains of propellant, they tend to be very quiet in a suppressed firearm. ![]() They are also easy to build for the home reloader. They are available from a number of suppliers at reasonable cost. Subsonic rounds that will not cycle the M16 action are fairly common. 223 bullets need a 7" twist in order to stabilize, and WILL NOT WORK with a 12" twist. They will print better and do more damage upon striking. If accuracy is a problem with a slow twist, simply turn the bullets around and shoot them backwards. Pricing for subsonic and high velocity ammunition that deforms substantially on striking tissue is greater, as the bullets for these rounds are custom built. 223 rounds are available, but they offer little over the. Also includes some Hornet information too) (Probably a little dated as it does not mention ballistic tip 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.Subsonic and reduced 223 reloads – with discussion on effectiveness and focus on use with suppressors Having a high BC bullet at subsonic does not benefit the shooter at all. BC (ballistic coefficient) is for supersonic flight, and does not matter at subsonic speeds. 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. 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 if you 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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