With the evolution of the international situation and the introduction of asymmetric conflicts arises the need to have an ammunition capable of eliminate the modern threats of suicide terrorism.

The 300 BLK is in an intermediate position between the 5.56×45 and 7.62×39 ensuring a greater power of arrest compared to 5.56 and better ballistics than 7.62×39 and also has better subsonic performance than the 9 mm.

The 300 BLK presents then with high stopping power and a reasonable accuracy over short distances; is optimal for use with a sound suppressor and was created by Advanced Armament Corporation in cooperation with Remington Defense.

The project was developed on the key points as mentioned before:
– stopping power
– good subsonic performance
– precision

But besides these he has wanted to develop a system to use the same M4 platform (300 BLK uses only a dedicated barrel) without distorting it:
– high-mass projectiles with high penetration
– optimal platform for sound and flash suppressed fire
– low recoiling, lightweight, durable package
– utilize existing inventory magazines 30 rnd with same capacity
– non-drastic changes to the M4 platform
– supersonic ammo with ballistics similar to 7.62×39mm

Projects similar to this are 6.8 spc and 6.5 Grendel but do not allow to have the Magazine to their full capacity of 30 rounds

The US Military rates the Max Effective Range of the M4 as 500 meters for a point target.
If the max effective range of the M4 with M855 at 2900 fps is 500 meters, than has 100 inches of drop, 41 inches drift, and 291 ft-lbs of energy at that distance.

A 16 inch 300 AAC BLK 125 grain at 2220 fps has:
-100 inch drop at 440 meters
-41 inches drift at 484 meters
-291 ft-lbs of energy at 700 meters

While the 300 BLK has far more energy, the military goes by hit probability.
If we consider than the drift and drop range is correlated with it probability, and discount the energy advantage of 300BLK, we get 462 meters for equal hit probability so using the M4 military standards, the max effective range of 300BLK from 16 inch barrel is 460 meters

From a 9 inch barrel at 2050 fps
-100 inch drop at 410 mt
-41 inch drift ay 470 mt
-291 ft-lbs of energy at 625 mt,
so 440 meter max effective range for 9 inch.

300 BLK from 9 inch barrel has the same energy at the muzzle as a 14.5 inch barrel M4, and about 5% more energy at 440 mt

A 300 BLK PDW compared to MP5-SD3 has approximately the same weight and the same size but 300 BLK has over two times the energy at the muzzle and even more down range
MP5-SD3 =>         115 grain at 900 fps & 6-9 MOA at 100 mt
300 BLK PDW => 220 grain at 965 fps & 1-3 MOA at 100 mt

Also using a silencer there is an increase in the cyclic rate of fire of only 16 % with 9-inch barrel compared to 34% of 
M4 in 5.56 mm with 10.3 inch barrel.

The 300 BLK 9” PDW Sound Signatures ranging from 126 to 135 dB while:
MP5 – SD w / HK Silencer _126dB
M4 w / Silencer KAC SOPMOD _138dB
Mk23 _139dB

09 in (230 mm) barrel_300 AAC BLK, 115 gr UMC_2,120 ft/s (650 m/s)_1,136 ft·lbf (1,540 J)
16 in (410 mm) barrel_300 AAC BLK, 115 gr UMC_2,295 ft/s (700 m/s)_1,344 ft·lbf (1,822 J)
09 in (230 mm) barrel_300 AAC BLK, 125 gr OTM_2,030 ft/s (620 m/s)_1,143 ft·lbf (1,550 J)
16 in (410 mm) barrel_300 AAC BLK, 125 gr OTM_2,215 ft/s (675 m/s)_1,360 ft·lbf (1,840 J)

several technical information are taken from ”300aacblackout.com”

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