223 Remington ammunition can be safely fired in a rifle chambered for 5.56×45mm NATO, firing 5.56 ammunition in a. This has resulted in a lengthening of the throat in the 5.56 chamber. The 5.56 chamber specification has also changed since its adoption, as the current military loading (NATO SS-109 or US M855) uses longer, heavier bullets than the original loading.
SUBSONIC 223 FOR SALE FULL
223 Remington, and the methods for measuring pressures differ between NATO and SAAMI. This cost effective 223 ammunition is loaded with Lake City brass, small rifle primer and Accurate powder along with a 55 grain full metal jacket (FMJ). The maximum and mean pressures for some varieties of the 5.56 (different cartridge designations have different standards) exceed the SAAMI maximum for the. 223 Remington and 5.56×45mm differ in both maximum pressure and chamber shape. While the external case dimensions are very similar, the. This rifle ammunition is loaded with a 0.224-inch (5.7 mm) diameter jacketed bullet, with weights ranging from 40 to 90 grains though the most common loading by far is 55 grains. The name is commonly pronounced either two-two-three or two-twenty-three. 223 Remington is a cartridge with almost the same external dimensions as the 5.56×45mm NATO military cartridge. 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.The. 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 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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