The CBJ Technology 7.62x51 NATO.300 Blackout 6.5x25 CBJ Ball
The CBJ Technology CBJ Tech AB has developed the 6.5x25 CBJ Cartridge, which utilizes subcaliber technology (tungsten core projectile inside a plastic sabot that separates after the muzzle), to achieve an optimized and class leading performance regarding penetration capability and stopping power. The cartridge is optimized for use in pistols, PDW s, submachine guns and short carbines. The subcaliber technology is scalable and is now being developed for the 7.62x51 Nato and the 300 Blackout. These rounds have superior armor piercing capability and accuracy, making them suitable for both sniping at long ranges and engaging hard targets like APC s or personnel with advanced body armor. 7.62x51 NATO.300 Blackout 6.5x25 CBJ Ball The subcaliber technology is not new. Similar products, like the SLAP, are already on the market. The problem with these is that they cannot be fed through an automatic cycling weapon without feeding problems, due to the exposed tip of the core projectile. CBJ Tech AB s solution is far superior to the existing products both regarding functionality and performance. The core projectile is completely encapsulated by the sabot, which has an outer geometry similar to FMJ projectiles. This ensures that the feeding works properly in automatic cycling weapons, and provides better support for the core projectile during the acceleration through the barrel. The metal gas check ensures that rotation is transferred to the core projectile through a pattern at the rear end of the core projectile without rotational slip. This gives the ammunition superior accuracy, even at high or especially at low temperatures. FMJ SLAP CBJ 7.62x51 NATO
Key characteristics for the CBJ Subcaliber Technology: High muzzle velocity; V 0 of 730-1015m/s depending on barrel length Extreme penetrating performance against hard targets, like armor High hit probability due to low recoil and good ballistic performance short time of flight and flat trajectory High wounding effect due to high impact velocity High system flexibility possibility to combine with non subcaliber ammunition, like subsonic or frangible 10% ballistic gelatin 8mm armor plate from an MT-LB APC Ballistic Data Cartridge 7.62x51 Nato CBJ.300 Blackout CBJ 6.5x25 CBJ Ball Projectile weight, g 6 6 2 Sabot weight, g 1 1 0,5 Barrel length, mm 450 610 254 406 120 300 V 0, m/s 850 1015 675 725 730 900 E 0, J 2168 3091 1406 1622 533 810 V 50, m/s 822 984 654 703 678 841 E 50, J 2025 2907 1321 1526 460 707 V 300, m/s 687 837 556 601 457 578 E 300, J 1418 2100 953 1114 209 334 There are several cartridges on the market that would really benefit from utilizing the subcaliber technology. Below are some examples that are optimized for the AR15 platform. 5.56x45 Nato 6.5 Grendel 6.8 SPC.300 Blackout (Not suitable) (Under development) The current standard ammunition for this system is 5.56x45 NATO. The obvious solution would be to utilize subcaliber technology on this cartridge. However, due to the geometry and characteristics of this cartridge this is very hard to achieve and the result would be pointless due to a very small and light core projectile.
Performance of the 7.62x51 CBJ The charts below compare a typical standard 7.62x51 Ball round, the US M80, with the performance of the M993 AP, 7.62x51 SLAP and the CBJ projectile when shot from a 24 (610mm) barrel, which is typical for a sniper rifle or a machine gun. The calculations are based on the following: V 0 has been verified during several tests. The Ballistic Coefficient (BC) is calculated with regards to the projectiles characteristics, like caliber, nose length, nose radius, nose shape, boat tail, density and overall length. For simplicity and comparison purposes, the G7 drag function is used in all cases. The data used in the calculations is as follows: 7.62x51 M80 7.62x51 M993 7.62x51 SLAP 7.62x51 CBJ BC (G7): 0.20 BC (G7): 0.176 BC (G7): 0.165 BC (G7): 0.274 M: 147gr (9.5g) M: 126.6gr (8.2g) M : 60gr (3.9g) M: 93gr (6g) V0: 833m/s V0: 930m/s V0: 1220m/s V0: 1015m/s
Trajectory height [cm] Trajectories Zero: 800m Barrel length: 24" (610mm) 300 250 200 M80 Ball 147gr @800m M993 AP 126.6gr @800m 7.62x51 SLAP @800m 7.62x51 CBJ @800m 150 100 50 0 Distance [m] 0 100 200 300 400 500 600 700 800 900 1000-50 -100-150 -200-250 -300
Trajectory height [cm] 650 600 550 500 Trajectories Zero: 1000m Barrel length: 24" (610mm) M993 AP 126.6gr @1000m M80 Ball 147gr @1000m 7.62x51 SLAP @1000m 7.62x51 CBJ @1000m 450 400 350 300 250 200 150 100 50 0 Distance [m] 0 100 200 300 400 500 600 700 800 900 1000 1100 1200-50 -100-150 -200-250 -300
Energy [J] Velocity [m/s] 1250 1200 1150 1100 1050 1000 950 900 850 800 750 700 650 600 550 500 450 400 350 300 250 200 150 100 50 0 Velocities Barrel length: 24" (610mm) 7.62x51 CBJ 7.62x51 SLAP M80 Ball 147gr M993 AP 126.6gr Distance [m] 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 3600 3400 3200 3000 2800 2600 2400 2200 2000 1800 1600 1400 1200 1000 800 600 400 200 0 Energies Barrel length: 24" (610mm) 7.62x51 CBJ M80 Ball 147gr M993 AP 126.6gr 7.62x51 SLAP Distance [m] 0 200 400 600 800 1000 1200
Penetration performance of the 7.62x51 CBJ The 7.62x51 CBJ is still under development and the performance is continuously being evaluated. Apart from the ballistic performance a lot of focus is on the penetration performance against different kinds of barriers between the shooter and the intended target. 7.62x51 M80 Ball 7.62x51 CBJ A barrier that is being more and more common is body armor. At this point the potential of the 7.62x51 CBJ has not been fully evaluated yet, but the picture above shows a body armor panel with the classification NIJ level IV. The panel was penetrated with the 7.62x51 CBJ at 10m range. As a reference, it was also shot with a 7.62x51 M80 Ball cartridge at the same distance, without penetration of the panel. 7.62x51 M80 Ball 7.62x51 CBJ The 18mm armor plate (HB300) shown in the picture to the left shows another performance test of the 7.62x51 CBJ. It was shot at 10m range with the 7.62x51 CBJ (right hit) and left hit is from an M80 ball at the same range.
Performance of the.300 Blackout CBJ The charts on the following pages compare a typical.300 Blackout round, with a 125gr FMJ projectile, with the.300 Blackout CBJ. Both projectiles have been shot from a 16 (406mm) barrel, which is typical for a full length assault rifle for this cartridge. The calculations are based on the following: V 0 has been verified during several tests. The primary test weapon used is an unmodified AR15 in caliber.300 Blackout with 16 inch barrel, as shown in the picture: The weapon cycles without problems with standard setting on the gas block. The recoil is identical to factory loaded.300 Blackout ammunition with 110 grain (7.1g) FMJ projectiles, which is soft and manageable, even during full auto firing. The Ballistic Coefficient (BC) is calculated by using existing formulas that calculates BC with regards to the projectiles characteristics, like caliber, nose length, nose radius, nose shape, boat tail, density and overall length. For simplicity and comparison purposes, the G7 drag function is used in all cases. The data used in the calculations is as follows: 5.56x45 M855 6.5 Grendel FMJ 6.8 SPC FMJ.300 Blackout FMJ.300 Blackout CBJ BC (G7): 0.151 BC (G7): 0.263 BC (G7): 0.163 BC (G7): 0.151 BC (G7): 0.32 M: 62gr (4g) M: 123gr (8g) M: 115gr (7.5g) M: 125gr (8.1g) M : 93gr (6g) V 0: 910 m/s V 0: 750 m/s V 0: 785 m/s V 0: 675 m/s V 0: 725m/s
Trajectory height [cm] 140 Trajectories Barrel length: 16" (406mm) 130 120 110 100 90 80 70 60 50 40 30 20 10 0-10 -20-30 -40-50 -60-70 -80-90 Range [m] 0 100 200 300 400 500 600 300 BLK Ball 125gr @500m 6.8 SPC 115gr @500m 6.5 Grendel 123gr @500m 300 BLK CBJ @500m M855 Ball 62gr @500m 300 BLK Ball 125gr @300m 6.8 SPC 115gr @300m 6.5 Grendel 123gr @300m 300BLK CBJ @300m M855 Ball 62gr @300m -100
Energy [J] Velocity [m/s] 950 900 850 800 750 700 650 600 550 500 450 400 350 300 250 200 150 100 50 0 Velocities Barrel length: 16" (406mm) 300 BLK CBJ 6.5 Grendel 123gr M855 Ball 62gr 6.8 SPC 115gr 300 BLK Ball 125gr Range [m] 0 50 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 2300 2200 2100 2000 1900 1800 1700 1600 1500 1400 1300 1200 1100 1000 900 800 700 600 500 400 300 200 100 0 Energies Barrel length: 16" (406mm) 6.5 Grendel 123gr 300 BLK CBJ 6.8 SPC 115gr 300 BLK Ball 125gr M855 Ball 62gr Range [m] 0 50 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800
Penetration performance of the.300 Blackout CBJ The penetrating performance has been tested against several types of armor and other types of barriers. The picture below shows an armor plate with a thickness of 12.7mm and a hardness of 300 HB. This plate was shot with the.300 Blackout CBJ at 10m range giving the core projectile a hitting velocity of 720m/s. The hit to the right shows the full penetration of the projectile. The left hit is from a.300 Blackout FMJ 125gr at the same range with a hitting velocity of 670m/s, showing no penetration. Several tests have also been done against thinner armor plates, like the one below which has been used in previous testing with the 6.5x25 CBJ Ball. This armor plate is 7mm thick and has a hardness of 450 HB. The.300 Blackout CBJ is able to penetrate this plate at 500m range, with a hitting velocity of 526 m/s. The same range and hitting velocity is listed for the 7.62x51 M993 AP round as maximum range for penetration of this armor plate.
.300 Blackout CBJ against CRISAT panels The.300 Blackout CBJ has also been tested against NATO CRISAT Panels (NIJ Level 3a) consisting of a 1.6mm grade 5 titanium plate in front of 24 layers of Kevlar. This panel stops all 9mm FMJ projectiles, even at point blank range. The.300 Blackout CBJ has velocity and energy enough to penetrate this panel at a range beyond 1200m, which in practical terms means that it will be penetrated at any range where it can be hit..300 Blackout CBJ against ballistic gelatin Several tests have been done against blocks of ballistic gelatin. The picture below shows a typical cavity from a.300 Blackout CBJ projectile. Firing direction Projectile Target Cavity Diameter: Ø5mm 10% Ballistic gelatin block (+4 Celsius) Full penetration of the block >340mm Weight: 6g Height: 200mm Temporary cavity >170mm BC G7: 0,33 Width: 250mm Permanent cavity 24mm Vt (hitting velocity): 720 m/s Length (firing direction): 340mm
Technical specifications and numerical data are given as an indication only and are of no contractual nature.