| 6.5×25mm CBJ | |
| Origin: | Sweden |
| 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] |
| Parent: | 9×19mm Parabellum[2] |
| Case Type: | Rimless, bottleneck |
| Bullet: | 0.157 |
| Length: | 1.169 |
| Primer: | 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.
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 2g, 4mm diameter tungsten kinetic penetrator, weighing a total of 2.5g with the sabot. It has a muzzle velocity of 730m/s from a 120mm barrel with a muzzle energy of 533J. From a 300mm barrel, it has a muzzle velocity of 900m/s with a muzzle energy of 810J, and has good armor penetration out to . The standard saboted tungsten ball, when fired from a 300mm length barrel, can pierce of armor plate and leave a 6mm 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 300mm barrel, the tungsten saboted round has the same trajectory as a 5.56 NATO from an M4 carbine and a velocity of at, 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 2.5g high-energy-transfer round that can penetrate CRISAT armor up to 50m (160feet), and a frangible round for training and situations requiring minimal barrier penetration. A subsonic armor-piercing round weighs 8g for use with a suppressor.[4]
| Saab Bofors Dynamics CBJ-MS | early 2000s | |
| Brügger & Thomet MP9 | 2010 | |
| Glock 17 rechambering kit[6] | ||
| SIG Sauer SP 2022 rechambering kit | ||
| MP5K rechambering kit |