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 utilized on other common cartridges
like the 7.62x51 Nato and the new 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
7.62x51 NATO
CBJ
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Key characteristics for the CBJ Subcaliber Technology:
High muzzle velocity; V0 of 730-1015m/s depending on barrel length
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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
8mm armor plate
from an MT-LB APC
10% ballistic gelatin
Ballistic Data
Cartridge
Projectile weight, g
Sabot weight, g
Barrel length, mm
V0, m/s
E0, J
V50, m/s
E50, J
V300, m/s
E300, J
7.62x51 Nato CBJ
6
1
450
610
850
1015
2168
3091
822
984
2025
2907
687
837
1418
2100
.300 Blackout CBJ
6
1
254
406
675
725
1406
1622
654
703
1321
1526
556
601
953
1114
6.5x25 CBJ Ball
2
0,5
120
300
730
900
533
810
678
841
460
707
457
578
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.
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
5.56x45 Nato
6.5 Grendel
6.8 SPC
.300 Blackout
achieve and the result would
(Not suitable)
(Under development)
be pointless due to a very
small and light core projectile.
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Performance of the 7.62x51 CBJ
The charts below compares 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:
V0 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
BC (G7): 0.20
M: 147gr (9.5g)
V0: 833m/s
7.62x51 M993
BC (G7): 0.176
M: 126.6gr (8.2g)
V0: 930m/s
7.62x51 SLAP
BC (G7): 0.165
M : 60gr (3.9g)
V0: 1220m/s
7.62x51 CBJ
BC (G7): 0.274
M: 93gr (6g)
V0: 1015m/s
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Trajectories
Zero: 800m
Barrel length: 24" (610mm)
300
M80 Ball 147gr @800m
M993 AP 126.6gr @800m
250
7.62x51 SLAP @800m
7.62x51 CBJ @800m
200
150
100
Trajectory height [cm]
50
Distance [m]
0
0
100
200
300
400
500
600
700
800
900
1000
-50
-100
-150
-200
-250
-300
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Trajectories
Zero: 1000m
Barrel length: 24" (610mm)
650
M993 AP 126.6gr @1000m
600
M80 Ball 147gr @1000m
550
7.62x51 SLAP @1000m
7.62x51 CBJ @1000m
500
450
400
350
300
250
200
150
Trajectory height [cm]
100
50
Distance [m]
0
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
-50
-100
-150
-200
-250
-300
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Velocities
Velocity [m/s]
Barrel length: 24" (610mm)
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
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
Energies
Barrel length: 24" (610mm)
3600
3400
7.62x51 CBJ
3200
M80 Ball 147gr
3000
2800
M993 AP 126.6gr
2600
7.62x51 SLAP
2400
2200
2000
1800
1600
1400
1200
Energy [J]
1000
800
600
400
200
Distance [m]
0
0
200
400
600
800
1000
1200
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Penetration performance of the 7.62x51 CBJ
One of the best 7.62x51 AP rounds on the market is made by Nammo and has been adopted by the US Government as
the M993. It is a full caliber projectile consisting of a tungsten-carbide penetrator fitted in a jacket. The basic
characteristics of the M993 penetrator compared to the CBJ core projectile are as follows:
7.62x51 M993 (Penetrator):
Mass: 5.9g
Diameter: 5.6mm
7.62x51 CBJ (Core Projectile):
Mass: 6g
Diameter: 5.5mm
The CBJ and the M993 core projectiles are very similar in size and weight. The M993 core projectile is harder, but have
to shed a copper jacket during penetration, it can be assumed that the penetration performance will be similar at equal
target hitting velocities. The M993 is quite light (8.2g) and thus fast, compared to the M80 Ball, but the complete CBJ
projectile is even lighter and has a significantly higher V0 and substantially lower drag. This means that the CBJ core
projectile will have a higher target hitting velocity than the M993 at any range, and the difference will increase with
range.
Armor penetration M993 vs CBJ
Listed penetration for the M993 is as follows:
18mm armor plate (HB 300) at 100m range.
7mm armor plate (HB 450) at 500m range.
7mm 450HB
armor plate
7.62x51 CBJ
At equal hitting velocities for the 7.61x51 CBJ
this corresponds to:
7.62x51 M993 AP
18mm 300HB
armor plate
18mm armor plate (HB 300) at 300m range.
Distance [m]
7mm armor plate (HB 450) at 920m range.
0
200
400
600
800
1000
18mm armor plate (HB300) shot at 10m range with the 7.62x51
CBJ (right hit) during early testing. The left hit is from an M80
ball at the same range.
7.62x51 M993
7.62x51 CBJ
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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:
V0 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
BC (G7): 0.151 BC (G7): 0.263
BC (G7): 0.163
M: 62gr (4g)
M: 123gr (8g)
M: 115gr (7.5g)
V0: 910 m/s
V0: 750 m/s
V0: 785 m/s
.300 Blackout FMJ
BC (G7): 0.151
M: 125gr (8.1g)
V0: 675 m/s
.300 Blackout CBJ
BC (G7): 0.32
M : 93gr (6g)
V0: 725m/s
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Trajectories
Barrel length: 16" (406mm)
140
130
120
110
100
90
80
70
60
50
40
30
Trajectory height [cm]
20
10
Range [m]
0
0
100
200
300
400
500
600
-10
-20
300 BLK Ball 125gr @500m
-30
-40
6.8 SPC 115gr @500m
6.5 Grendel 123gr @500m
300 BLK CBJ @500m
-50
-60
M855 Ball 62gr @500m
300 BLK Ball 125gr @300m
6.8 SPC 115gr @300m
-70
-80
6.5 Grendel 123gr @300m
300BLK CBJ @300m
M855 Ball 62gr @300m
-90
-100
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Velocities
Velocity [m/s]
Barrel length: 16" (406mm)
950
900
850
800
750
700
650
600
550
500
450
400
350
300
250
200
150
100
50
0
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
Energies
Energy [J]
Barrel length: 16" (406mm)
2300
2200
2100
2000
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
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
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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.
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.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
Weight: 6g
BC G7: 0,33
Vt (hitting velocity): 720 m/s
10% Ballistic gelatin block (+4° Celsius)
Height: 200mm
Width: 250mm
Length (firing direction): 340mm
Full penetration of the block >340mm
Temporary cavity >170mm
Permanent cavity 24mm
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Technical specifications and numerical data are given as an indication only
and are of no contractual nature.