6.5×25mm CBJ

Short description: Swedish pistol cartridge

6.5×25mm CBJ

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| 9×19mm Parabellum[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 firearm cartridge designed by CBJ Tech AB, a Swedish weapon development company based in Kungsbacka, for its CBJ-MS submachine gun/personal defence weapon.

## Contents

* 1 Description
* 2 Platforms
* 3 See also
* 4 References
* 5 External links

## Description

Named after CBJ Tech AB's founder and president Carl Bertil Johansson,[3] 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 caliber 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 the same magazines. The primary loading of the standard ball round fires a saboted 2 g (31 gr), 4 mm diameter tungsten kinetic penetrator, weighing a total of 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 m (440 yd). The standard saboted tungsten ball, when fired from a 300 mm length barrel, can pierce 9 mm (0.35 in) of armor plate and leave a 6 mm diameter entry hole.[4] Against the same plate, both 5.56×45mm NATO SS109 and 7.62×51mm NATO M80 failed to penetrate.[4][5] 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.[4] The 6.5×25mm CBJ brass-jacketed ball rounds are heavier than similar rounds in the FN 5.7×28mm and HK 4.6×30mm.[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 cavitate 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.[4]

## Platforms

Name  | Year

|

Saab Bofors Dynamics CBJ-MS | early 2000s
Brügger & Thomet MP9  | 2010
Glock 17 rechambering kit[6] |
SIG Sauer SP 2022 rechambering kit[6] |
MP5K rechambering kit[6] |

## See also

* List of cartridges by caliber
* List of rifle cartridges
* 5.7×28mm
* 4.6×30mm
* 6 mm caliber

## References

1. ↑ Cartridge Information retrieved 24 November 2009
2. ↑ thefirearmblog.com – The amazing 6.5x25mm CBJ
3. ↑ "CBJ Tech – About Us". http://www.cbjtech.com/about-us/.
4. ↑ 4.0 4.1 4.2 4.3 4.4 Brugger & Thomet’s MP9 in 6.5×25 CBJ – SAdefensejournal.com, 14 October 2011
5. ↑ Where Next For PDWs? – /www.quarry.nildram.co.uk
6. ↑ 6.0 6.1 6.2 "the new 6.5x25 CBJ cartridge". 2023-09-10. https://web.archive.org/web/20230910192244/https://www.gotavapen.se/gota/cbj/cbj_crtg.htm.

## External links

* A new weapon system from Sweden

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