6.5×25 mm CBJ

The 6.5×25mm CBJ is a pistol cartridge designed for the CBJ-MS personal defence weapon.

6.5×25mm CBJ
Place of originSweden
Production history
ManufacturerCBJ Tech AB
VariantsCBJ
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 case9×19mm Parabellum[2]
Case typeRimless, bottleneck
Bullet diameter0.157 in (4.0 mm)
Overall length1.169 in (29.7 mm)
Primer typeLarge pistol

Description

The 6.5×25mm CBJ has the same functional dimensions as the 9×19mm Parabellum and was designed to produce the same recoil and pressures to allow most 9 mm weapons to be converted to 6.5×25mm CBJ with a simple barrel change. Also, because the 6.5×25mm CBJ has the same overall dimensions as the 9×19mm Parabellum, it can be used in 9 mm magazines. The primary loading of 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.[3] Against the same plate, both 5.56x45 NATO SS109 and 7.62x51 NATO Ball failed to penetrate.[3] [4] 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.[3] 6.5×25mm CBJ rounds are slower and heavier than both 5.7×28mm and 4.6x30mm.[3]

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 requiring minimal barrier penetration. A subsonic armor-piercing round weighs 8 g (120 gr) for use with a suppressor.[3]

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See also

References
  1. Cartridge Information retrieved 24 November 2009
  2. thefirearmblog.com - The amazing 6.5x25mm CBJ
  3. Brugger & Thomet’s MP9 in 6.5×25 CBJ - SAdefensejournal.com, 14 October 2011
  4. Where Next For PDWs? - /www.quarry.nildram.co.uk
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