9x21mm cartridge

9x21mm cartridge

9x21mm maximum C.I.P. cartridge dimensions.[1] All sizes in millimeters (mm).

The common rifling twist rate for this cartridge is 254 mm (1 in 10 in), 4 grooves, Ø lands = 8.79 mm, Ø grooves = 9.03 mm, land width = 3.80 mm and the primer type is small pistol.

According to the official C.I.P. (Commission Internationale Permanente Pour L'Epreuve Des Armes A Feu Portative) guidelines the 9x21mm case can handle up to 235 MPa (34,083 psi) piezo pressure. In C.I.P. regulated countries every pistol cartridge combo has to be proofed at 130% of this maximum C.I.P. pressure to certify for sale to consumers.

[edit] Performance
The performance is similar to the 9x19mm Parabellum cartridge, in terms of velocity and energy.

9x21mm

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115 gr (7.45 g) FMJ 390 m/s (1,300 ft/s) 570 J (420 ft·lbf)

124 gr (8.04 g) FMJ 360 m/s (1,200 ft/s) 520 J (384 ft·lbf)

9x19mm Parabellum

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115 gr (7.45 g) FMJ 351 m/s (1,150 ft/s) 458 J (338 ft·lbf)

124 gr (8.04 g) FMJ 335 m/s (1,100 ft/s) 452 J (333 ft·lbf)

147 gr (9.54 g) FMJ 302 m/s (990 ft/s) 434 J (320 ft·lbf)

[edit] Notes
As it is a rimless round, the 9x21mm is used in USPSA/IPSC competition in Open class firearms. The reasoning is that the semi-rimmed case will not lock together in a double-column magazine, causing a malfunction, whereas an improperly built .38 Super firearm can, as the rimmed cases can lock together in the magazine, causing a jam. As other .38 Super based .38 Super Auto rimless cases became available, the 9x21mm decreased in popularity in the United States for competition use, but it is still widely used in the rest of the world.

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1 Comment

4 years 50 weeks ago, 12:01 AM

Anonymous

SamD

Are ther a 9x21mm ammunition called the "GURZA"?

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Posted by: samD
4 years 50 weeks ago
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