Our top selling 223/5.56 SUBSONIC round (priced per 100 rounds). Once-fired LC brass, Hornady 55 grain SP (soft point) @ 1030 fps. This ammo is loaded to SUBSONIC speeds for barrels from 10″ to about 22″ barrels. This subsonic ammo is not designed for barrels longer than 22″.  This ammo will NOT cycle an AR-15, but you can manually cycle the bolt. This ammo is designed for 1:10″ twist or faster (1:9″, 1:8″. 1:7″. etc). If you have a 1:12″ twist, you will need to check bullet stability first before shooting through a suppressor. 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.

Priced per 100 rounds.


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. 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. 

Priced per 100 rounds.


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. Bullet length is a major factor in how stable it is out of the muzzle. 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. The 55 grain SP flat base is a much shorter bullet than a similar weight 55 V-max or BTHP design. 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. BC (ballistic coefficient) is for supersonic flight, and does not matter at subsonic speeds. Having a high BC bullet at subsonic does not benefit the shooter at all. This is why the 55 grain SP flat base bullets work well as subsonic round!

Bullet Trajectory- Distance is in Yards and drop is in inches.

25 +1.94 (high)
50 +3.51 (high)
75 +2.88 (high)
100 -0.01 (100 yard zero)
125 -5.22 (low)
150 -12.84 (low)
175 -22.92 (low)
200 -35.52 (low)

1 review for 223/5.56 SUBSONIC

  1. David Clarke (verified owner)

    I love these rounds! They are great for target practice with my silenced BCM 16″ AR. I haven’t had a single round fail. They do require manual cycling as described but I do not find that to be any problem at all.

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