6.5×25mm CBJ

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6.5×25mm CBJ
Type Pistol
Place of origin  Sweden
Production history
Manufacturer CBJ Tech AB
Variants CBJ
CBJ ST (spoon tip)
CBJ HET (high energy transfer)
CBJ Subsonic AP
CBJ TRP (training reduced penetration)
CBJ Frangible
CBJ Blank
CBJ Drill[1]
Specifications
Parent case 9×19[2]
Case type Rimless, bottleneck
Bullet diameter 0.157 in (4.0 mm)
Overall length 1.169 in (29.7 mm)
Primer type Large Pistol

The 6.5×25mm CBJ is a pistol cartridge designed for the CBJ-MS personal defence weapon. Capable of use in rebarreled 9×19mm Parabellum firearms, the primary loading of the round fires a sabotted 4 mm tungsten sub-projectile.

The 6.5×25mm CBJ has the same functional dimensions as the 9×19 Parabellum and was designed to produce the same recoil and pressures to allow most 9mm weapons to be converted to 6.5×25mm CBJ with a simple barrel change.

Because the 6.5×25mm CBJ has the same overall dimensions as the 9×19 Parabellum, it can be used in 9 mm magazines. The standard ball round fires a saboted tungsten 2 g (31 gr) 4.0 mm diameter sub-projectile, weighing 2.5 g (39 gr) with the sabot. It has a muzzle velocity of 730 m/s (2,400 ft/s) from a 120 mm (4.7 in) barrel with a muzzle energy of 533 J (393 ft·lb). From a 300 mm (12 in) barrel, it has a muzzle velocity of 900 m/s (3,000 ft/s) with a muzzle energy of 810 J (600 ft·lb), and has good armor penetration out to 400 meters. The standard saboted tungsten ball round can pierce 9 mm of armor plate and leave a 6 mm diameter entry hole when fired from a 300 mm length barrel. By comparison, 5.56 NATO and 7.62 NATO rounds cause little or no penetration to armor of that thickness. From a 300 mm barrel, the tungsten saboted round has the same trajectory as a 5.56 NATO from an M4 carbine and a velocity of 578 m/s (1,900 ft/s) at 300 m (328 yd), which will penetrate CRISAT armor. 6.5×25mm CBJ rounds are faster and heavier than both 5.7×28mm and 4.6×30mm.[3][4]

There are several other 6.5×25mm CBJ bullets other than the sabot in full-caliber. Military rounds include a "spoon-tip" loading that increases the chance of the bullet to yaw on impact, and a cheap training version with a different core material. Police rounds include a 2.5 g (39 gr) high-energy-transfer round that can penetrate CRISAT armor at up to 50 meters, and a frangible round for training and situations for minimal barrier penetration. A subsonic armor-piercing round weighs 8 g (120 gr) for use with a suppressor.[4]

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