View source for Engineering:6.5×25 mm CBJ

{{infobox firearm cartridge
|name=6.5×25mm CBJ
|image=
|caption=
|origin=Sweden
<!-- Service history -->
|service=
|used_by=
|wars=
<!-- Production history -->
|designer=
|design_date=
|manufacturer=CBJ Tech AB
|production_date=
|number=
|variants=CBJ<BR />CBJ ST (spoon tip)<BR />CBJ HET (high energy transfer)<BR />CBJ subsonic AP<BR />CBJ TRP (training reduced penetration)<BR />CBJ frangible <BR />CBJ Blank<BR />CBJ drill<ref name="gotavapen">[http://gotavapen.se/gota/cbj/cbj_crtg.htm Cartridge Information retrieved 24 November 2009]</ref>
<!-- Specifications -->
|is_SI_specs=
|parent=[[Engineering:9×19mm Parabellum|9×19mm Parabellum]]<ref name="thefirearmblog">[http://www.thefirearmblog.com/blog/2010/07/08/the-amazing-6-5x25mm-cbj/ thefirearmblog.com - The amazing 6.5x25mm CBJ]</ref>
|case_type=Rimless, bottleneck
|bullet=0.157
|neck=
|shoulder=
|base=
|rim_dia=
|rim_thick=
|case_length=
|length=1.169
|case_capacity=
|rifling=
|primer=Large pistol
|max_pressure=
|max_cup=
|filling=
|filling_weight=
|detonation=
|yield=
<!-- Ballistic performance -->
|is_SI_ballistics=
|bwunit=
|bw1=
|btype1=
|vel1=
|en1=
|bw2=
|btype2=
|vel2=
|en2=
|bw3=
|btype3=
|vel3=
|en3=
|bw4=
|btype4=
|vel4=
|en4=
|bw5=
|btype5=
|vel5=
|en5=
|test_barrel_length=
|balsrc=
}}
The '''6.5×25mm CBJ''' is a [[Engineering:Firearm|firearm]] [[Engineering:Cartridge (firearms)|cartridge]] designed by CBJ Tech [[Finance:Aktiebolag|AB]], a Swedish weapon development company based in Kungsbacka, for its CBJ-MS [[Engineering:Submachine gun|submachine gun]]/personal defence weapon.

==Description==
Named after CBJ Tech AB's founder and president Carl Bertie Johansson,<ref>{{cite web|url=http://www.cbjtech.com/about-us/|title=CBJ Tech - About Us|access-date=2020-11-07}}</ref> the 6.5×25mm CBJ has the same functional dimensions as the [[Engineering:9×19mm Parabellum|9×19mm Parabellum]] and was designed to produce the same recoil and pressures to allow most [[Engineering:9 mm caliber|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 {{convert|2|g|gr|abbr=on}}, 4&nbsp;mm diameter [[Chemistry:Tungsten|tungsten]] kinetic penetrator, weighing a total of {{convert|2.5|g|gr|abbr=on}} with the sabot. It has a [[Physics:Muzzle velocity|muzzle velocity]] of {{convert|730|m/s|ft/s|abbr=on}} from a {{convert|120|mm|in|abbr=on}} barrel with a [[Physics:Muzzle energy|muzzle energy]] of {{convert|533|J|ftlb|abbr=on}}.  From a {{convert|300|mm|in|abbr=on}} barrel, it has a muzzle velocity of {{convert|900|m/s|ft/s|abbr=on}} with a muzzle energy of {{convert|810|J|ftlb|abbr=on}}, and has good [[Engineering:Armor-piercing bullet|armor penetration]] out to {{cvt|400|m|yd}}. The standard saboted tungsten ball, when fired from a 300&nbsp;mm length barrel, can pierce {{cvt|9|mm}} of armor plate and leave a 6&nbsp;mm diameter entry hole.<ref name="sadj">[http://sadefensejournal.com/wp/?p=625 Brugger & Thomet’s MP9 in 6.5×25 CBJ] - SAdefensejournal.com, 14 October 2011</ref> Against the same plate, both [[Engineering:5.56×45mm NATO#SS109/M855|5.56×45mm NATO SS109]] and [[Engineering:7.62×51mm NATO|7.62×51mm NATO M80]] failed to penetrate.<ref name="sadj"/> <ref name="nildram">[https://web.archive.org/web/20121025121720/http://www.quarry.nildram.co.uk/PDWs.htm Where Next For PDWs?] - /www.quarry.nildram.co.uk</ref> From a 300&nbsp;mm barrel, the tungsten saboted round has the same trajectory as a 5.56 NATO from an [[Engineering:M4 carbine|M4 carbine]] and a velocity of {{cvt|578|m/s}} at {{cvt|300|m|yd|0}}, which will penetrate CRISAT armor.<ref name="sadj"/> The 6.5×25mm CBJ bullets are slower and heavier than both the [[Engineering:FN 5.7×28mm|FN 5.7×28mm]] and [[Engineering:HK 4.6×30mm|HK 4.6×30mm]].<ref name="sadj"/>
 
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 {{convert|2.5|g|gr|abbr=on}} 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 {{convert|8|g|gr|abbr=on}} for use with a suppressor.<ref name="sadj"/>

==See also==
*[[Engineering:List of cartridges by caliber|List of cartridges by caliber]]
*[[Engineering:List of rifle cartridges|List of rifle cartridges]]
*5.7×28mm
*4.6×30mm
*[[Engineering:6 mm caliber|6 mm caliber]]

==References==
{{Reflist}}

==External links==
* [http://gotavapen.se/gota/cbj/cbj_syst.htm A new weapon system from Sweden]


{{DEFAULTSORT:6.5x25mm}}
[[Category:Pistol and rifle cartridges]]

{{Sourceattribution|6.5×25 mm CBJ|1}}