# 7.65×21mm Parabellum
The **7.65×21mm Parabellum** is a bottlenecked, rimless centerfire pistol cartridge developed by Georg Luger from Hugo Borchardt's 7.65×25 mm Borchardt round around 1898–99 for the Luger Parabellum semi-automatic pistol. It is also known as 7.65 mm Luger, 7.65 [Parabellum](https://www.edgepedia.org/parabellum), 7.65 Para, and in the United States as .30 Luger.[1](https://modernfirearms.net/en/cartridge/7-65x21-luger/) • [2](https://bobp.cip-bobp.org/uploads/tdcc/tab-iv/tabivcal-en-page14.pdf)
| Key fact | Detail |
|---|---|
| Designer and origin | Georg Luger, working for DWM, derived from the 7.65×25 mm Borchardt cartridge, around 1898–99[1](https://modernfirearms.net/en/cartridge/7-65x21-luger/) |
| First adoption | Switzerland, 1900, as the standard military cartridge with the Pistole Parabellum[1](https://modernfirearms.net/en/cartridge/7-65x21-luger/) |
| Case type | Bottlenecked, rimless brass case; typical loading is a jacketed bullet[1](https://modernfirearms.net/en/cartridge/7-65x21-luger/) |
| Case length | 21.59 mm (CIP maximum cartridge dimension L3)[2](https://bobp.cip-bobp.org/uploads/tdcc/tab-iv/tabivcal-en-page14.pdf) |
| Original load | DWM FMJ, 6.03 g bullet at 370 m/s, 412 J muzzle energy[1](https://modernfirearms.net/en/cartridge/7-65x21-luger/) |
| CIP maximum pressure | Pmax 2,350 bar[2](https://bobp.cip-bobp.org/uploads/tdcc/tab-iv/tabivcal-en-page14.pdf) |
| Headspace | On the case mouth, per the CIP chamber drawing[2](https://bobp.cip-bobp.org/uploads/tdcc/tab-iv/tabivcal-en-page14.pdf) |
| Military users | Switzerland, Brazil, Finland, Lithuania; obsolete as a military load since World War Two[1](https://modernfirearms.net/en/cartridge/7-65x21-luger/) |
## Origin and development
Georg Luger, an Austrian-born designer employed at Ludwig Loewe & Company in Berlin, which became Deutsche Waffen- und Munitionsfabriken (DWM), was given the job of improving Hugo Borchardt's C-93 pistol after the U.S. Army rejected it. The army's criticisms included unwieldy handling from its weight and nearly vertical grip, excessive recoil from the 7.65×25 mm Borchardt cartridge, and high production cost.[3](https://www.americanrifleman.org/content/the-9mm-luger-cartridge-history-and-performance/)
Luger shortened the Borchardt cartridge to a 21 mm case, creating the 7.65×21mm Parabellum, the name taken from the Latin phrase *Si vis pacem, para bellum*, "if you want peace, prepare for war," which was DWM's telegraphic address. The shorter cartridge let him lighten and shrink the toggle-link action, shorten the toggle stroke, and design a narrower, angled grip that balanced and pointed better. The result was the Luger Parabellum pistol of 1898.[3](https://www.americanrifleman.org/content/the-9mm-luger-cartridge-history-and-performance/)
## Dimensions and specifications
The cartridge has a bottlenecked, rimless brass case with a jacketed bullet as the typical loading.[1](https://modernfirearms.net/en/cartridge/7-65x21-luger/) The CIP tables give a maximum case length (L3) of 21.59 mm, an overall cartridge length (L6) of 29.85 mm, a projectile diameter (G1) of 7.85 mm, and a maximum service pressure (Pmax) of 2,350 bar; the chamber drawing notes that the cartridge headspaces on the case mouth.[2](https://bobp.cip-bobp.org/uploads/tdcc/tab-iv/tabivcal-en-page14.pdf) The CIP lists the alternative names 7,65 Para, 7,65 Luger, and 30 Luger.[2](https://bobp.cip-bobp.org/uploads/tdcc/tab-iv/tabivcal-en-page14.pdf)
In SAAMI's American dimensioning, the .30 Luger uses a bullet of .3095 in (7.861 mm) diameter in an .850 in (21.59 mm) case, with a four-groove, right-hand twist of 11.00 in; the drawing was issued 29 May 1979 and revised 27 March 2023, the revision correcting only the rim dimensions.[4](https://saami.org/wp-content/uploads/2023/03/New-Revised-Cartridge-and-Chamber-Drawing-30-Luger-2023-03-27.pdf)
The original DWM factory load drove a 6.03 g full-metal-jacket bullet at 370 m/s for 412 J of muzzle energy.[1](https://modernfirearms.net/en/cartridge/7-65x21-luger/) [Handloading](https://www.edgepedia.org/handloading) references describe typical bullets in the 85 to 95 grain range at relatively high velocities for the cartridge's size.[5](https://loaddata.com/Cartridge/30-Luger-765-Parabellum-Accurate-Loading-Guide-2/6407)
## Military and police service
**Switzerland.** Production began in 1900, and Switzerland immediately adopted the Pistole Parabellum in 7.65×21mm as its service pistol; the Swiss Federal Council decided on 4 May 1900 to take the Parabellum as the army's ordnance weapon and ordered 5,000 pistols from DWM, with later production under license at the Waffenfabrik (W+F) Bern.[3](https://www.americanrifleman.org/content/the-9mm-luger-cartridge-history-and-performance/) • [6](https://www.arquebuse.ch/gen_pages.php?f=musee_parabellum_1900.txt&mobile=0) The pistol equipped Swiss officers from 1900 to 1980, in the Model 1900, 1906, and 06/29 versions; the 06/29 remained in limited service until the late 1960s, well after the SIG Sauer P210 was adopted in 1949.[6](https://www.arquebuse.ch/gen_pages.php?f=musee_parabellum_1900.txt&mobile=0) • [7](https://www.valeorine.com/reference/luger-pistol)
**Other countries.** The cartridge was also used as a military load in Brazil, Finland, and [Lithuania](https://www.edgepedia.org/lithuania).[1](https://modernfirearms.net/en/cartridge/7-65x21-luger/) Brazil ordered 5,000 Luger pistols in 7.65mm Parabellum from DWM in 1906, many of which survive in Brazilian collections.[8](https://armasonline.org/armas-on-line/a-pistola-parabellum-luger/comment-page-1/) The Model 1900 Parabellum in this caliber was purchased or tested in limited numbers by Germany, the United States, and a range of other nations including Austria, Bulgaria, Canada, Chile, the Netherlands, Luxembourg, Russia, Norway, Sweden, and Portugal.[7](https://www.valeorine.com/reference/luger-pistol) European police agencies used the cartridge well into the 1960s.[3](https://www.americanrifleman.org/content/the-9mm-luger-cartridge-history-and-performance/)
A quirk of the interwar period: under the Versailles treaty the German pistol caliber had to be reduced to 7.65 mm, which required no change to production equipment.[9](https://www.deutsche-biographie.de/sfz55080.html)
## Relationship to the 9×19mm Parabellum
Germany led the move to a more powerful round. The [Imperial German Navy](https://www.edgepedia.org/imperial-german-navy) liked the pistol but was not convinced by the 7.65 mm bullet, and Luger developed the 9×19 mm round in 1902 by removing the bottleneck from the 7.65×21 case while retaining its taper, shortening the case from a net 21.59 mm to 19.15 mm; the standard bullet weight rose from 93 to 116 grains at a nominal 1,200 fps from a 4.25-inch barrel.[3](https://www.americanrifleman.org/content/the-9mm-luger-cartridge-history-and-performance/) • [10](https://euro-sd.com/wp-content/uploads/2024/02/ESD_2_2024.pdf) The German Navy adopted the pistol in 9mm in 1904 and the [German Army](https://www.edgepedia.org/german-army) followed in 1908.[10](https://euro-sd.com/wp-content/uploads/2024/02/ESD_2_2024.pdf)
## Obsolescence and legacy
Since World War Two the 7.65×21mm has been replaced by the more potent 9×19mm Luger and is obsolete as a military load.[1](https://modernfirearms.net/en/cartridge/7-65x21-luger/) It never found widespread popularity outside the Luger platform, but it remains a live, standardized chambering: CIP maintains current cartridge and chamber tables[2](https://bobp.cip-bobp.org/uploads/tdcc/tab-iv/tabivcal-en-page14.pdf) and SAAMI republished its .30 Luger drawing in 2023,[4](https://saami.org/wp-content/uploads/2023/03/New-Revised-Cartridge-and-Chamber-Drawing-30-Luger-2023-03-27.pdf) and ammunition is still produced for the surviving Swiss Lugers and other collectors' guns.
## References
1. [7.65×21 Luger, 7.65mm Parabellum, .30 Luger, Modern Firearms](https://modernfirearms.net/en/cartridge/7-65x21-luger/)
2. [C.I.P. Tab. IV, 7,65 Parabellum cartridge and chamber dimensions](https://bobp.cip-bobp.org/uploads/tdcc/tab-iv/tabivcal-en-page14.pdf)
3. [The 9mm Luger Cartridge: History and Performance, American Rifleman (NRA)](https://www.americanrifleman.org/content/the-9mm-luger-cartridge-history-and-performance/)
4. [SAAMI Revised Cartridge & Chamber Drawing, 30 Luger (7.65mm), 2023](https://saami.org/wp-content/uploads/2023/03/New-Revised-Cartridge-and-Chamber-Drawing-30-Luger-2023-03-27.pdf)
5. [Reloading Data .30 Luger / 7.65 Parabellum, LoadData.com](https://loaddata.com/Cartridge/30-Luger-765-Parabellum-Accurate-Loading-Guide-2/6407)
6. [Le Parabellum ou Lüger 7,65 de 1900 et suivants, Arquebuse Genève](https://www.arquebuse.ch/gen_pages.php?f=musee_parabellum_1900.txt&mobile=0)
7. [Luger pistol, Valéorine reference](https://www.valeorine.com/reference/luger-pistol)
8. [Pistola Parabellum "Luger", Armas On-Line](https://armasonline.org/armas-on-line/a-pistola-parabellum-luger/comment-page-1/)
9. [Luger, Georg, Deutsche Biographie](https://www.deutsche-biographie.de/sfz55080.html)
10. [Armament & Technology, European Security & Defence 2/2024](https://euro-sd.com/wp-content/uploads/2024/02/ESD_2_2024.pdf)
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*Topic: Encyclopedia › Technology and the built world › Engineering and manufacturing › Firearms and ammunition › Ammunition and cartridges › Handgun cartridges*
*Initially written Sep 17, 2026 · Reviewed: Sep 30, 2026; Oct 15, 2026 · Edited: Sep 30, 2026; Oct 15, 2026 · Last review: Oct 15, 2026*
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