6.5×25mm CBJ
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.
| 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 |
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]
References
- Cartridge Information retrieved 24 November 2009
- thefirearmblog.com – The amazing 6.5x25mm CBJ
- "CBJ Tech – About Us". Retrieved 7 November 2020.
- Brugger & Thomet’s MP9 in 6.5×25 CBJ – SAdefensejournal.com, 14 October 2011
- Where Next For PDWs? – /www.quarry.nildram.co.uk
