our 5. we have two different loads of cycling subsonic ammunition- this one is optimal for the short barrel 10.5'. 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.
please read description this ammo only cycles in our cs upper or cs rifle. Our top selling 223/5.56 SUBSONIC round (priced per 100 rounds). BC (ballistic coefficient) is for supersonic flight, and does not matter at subsonic speeds. 5.56mm cycling subsonic 75gr jhp - short barrel load. This allows the 75 grain HP flat base to be more stable and have the potential to be more accurate at subsonic speeds than a BTHP design that makes the bullet longer, requiring more twist rate to stabilize it. The 75 grain Sierra HP flat base is a much shorter bullet than a similar weight BTHP bullet, or a 100+ grain SP or HP bullet.
In a given 243 Win twist rate (like a 1:10″ barrel twist) and slow subsonic speeds, a shorter, flat base bullet is more stable than a longer BTHP match bullet is. Bullet length is a major factor in how stable a bullet is in a certain twist rate. 243″ bullet to fully stabilize at subsonic speeds in a given twist rate, bullet stability becomes a huge factor for it to stabilize and shoot well. Additional information Related products Magtech 7.65 (.32 auto) 71gr FMC Sellier & Bellot 9mm Luger Subsonic 140 grain FMJ HORNADY 17 HMR 17 gr V-MAX. Why use a 75 grain HP bullet? Most 243 Win barrels will have a 1:10″ twist barrel, with some having a 1:9″ twist or faster. 223 Remington 75 Grain Boat-Tail Hollow Point Match Centerfire Rifle Ammunition, 20, BTHP Match 25.68 (Save 18) 20.99 1.05/Round Atomic 00429 Rifle Subsonic 223 Rem 77 Gr Hollow Point Boat Tail (HPBT) 50 Bx/ 1, 50, HPBT 102.49 2. 223 caliber rifle cartridges will contain from 3.5 to 4.5 grains of moderately fast pistol propellant and a. This is with new high-end Norma brass and Sierra 75 grain HP bullet. In general terms, a typical standard subsonic. New!! By request, I recently developed a 243 Winchester SUBSONIC round shooting the 75 grain Sierra HP at 1030 fps in 22″ barrel.