9×21mm Gyurza

9×21mm

9x21 RG054 cartridge – the predecessor of SP10

Type

Place of origin

Service history

Used by

FSB
Russian Army

Production history

Designer

Produced

1990s–present

Variants

SP-10 (7N29), SP-11 (7N28), SP-12, SP-13 (7BTZ)

Specifications

Parent case

Case type

Straight, rimless

Bullet diameter

9.05 mm (0.356 in)

Shoulder diameter

9.6 mm (0.38 in)

Base diameter

9.9 mm (0.39 in)

Rim diameter

9.9 mm (0.39 in)

Rim thickness

1.2 mm (0.047 in)

Case length

20.9 mm (0.82 in)

Overall length

32.7 mm (1.29 in)

Ballistic performance

Bullet mass/type	Velocity	Energy
6.7 g (103 gr) 7N29	410 m/s (1,300 ft/s)	563 J (415 ft⋅lbf)
7.9 g (122 gr) 7N28	390 m/s (1,300 ft/s)	601 J (443 ft⋅lbf)
7.2 g (111 gr) 7BTZ	395 m/s (1,300 ft/s)	562 J (415 ft⋅lbf)

Source(s): Modern Firearms

The 9×21mm Gyurza (Гюрза, Russian for "blunt-nosed viper") round is a Russian handgun round designed to defeat body armor that was developed by TsNIITochMash for its SR-1 Vektor semi-automatic pistol and SR-2 Veresk submachine gun.