9×21mm
9x21 RG054 cartridge – the predecessor of SP10
Type	Pistol
Place of origin	Russia
Service history
Used by	FSB Russian Army
Production history
Designer	TsNIITochMash
Produced	1990s–present
Variants	SP-10 (7N29), SP-11 (7N28), SP-12, SP-13 (7BTZ)
Specifications
Parent case	9×21mm[1]
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:Modern Firearms

The9×21mmGyurza (Гюрза,Russian for "blunt-nosed viper") round is a Russianhandgun round designed to defeatbody armor that was developed byTsNIITochMash for itsSR-1 Vektorsemi-automatic pistol andSR-2 Veresksubmachine gun.

The method of construction of the rounds allows them to be effective against both unarmored and armored targets. The bullet has a hard sub-caliber core contained within an outer sleeve and separated from it by apolyethylene layer. If the bullet strikes an unarmored target, it holds together to produce a wide wound channel. If the bullet strikes an armored target, the sleeve is stripped away, and the core penetrates alone. The 7N29 AP loading fires a 6.7 g (103 gr) bullet at 410 m/s (1,300 ft/s) with 560 J (410 ft⋅lb) of muzzle energy and will reportedly penetrate two 1.2 mmtitanium plates, plus 30 layers ofKevlar, at 50 m (160 ft). The disadvantage of the rounds is that high impact velocities are needed for them to work effectively, so the bullets are relatively light to maximize their muzzle velocity. This means they will lose velocity relatively quickly, limiting their effective range.^[2]

SP-10-UCH – unloaded training cartridge^[3]

SP-10 (7N29, sometimes referred to asRG052^[1] orRG054^[4]) –armor-piercing bullet with hardened steel core^[5][6][7]

SP-11 (7N28) – standard FMJ bullet with lead core^[8][9]

SP-12 – lowricocheting,expanding bullet^[10][11]

SP-13 (7BT3) –tracer AP bullet based on 7N29^[12]

SP-17 – bullet with reduced environment penetration^[13]

• 9×21mm Gyurza
• 9mm Gyurza

• SR-1 Vektor
• SR-2 Udav
• SR-2 Veresk
• Gepard (submachine gun)

• 9x19mm 7H21,9x19mm 7H31 — Armor-piercing variant of 9×19mm Parabellum
• 9×30mm Grom — Uses RG054 bullet
• 9x21mm - 9x21mm pistol cartridge distinct from 9x21mm Gyurza, as a result of different cartridge dimension measuring systems. Sometimes referred to as 9x21mm IMI, GP, or Winchester

• 9×21mm pistol cartridgesArchived 2014-01-07 at theWayback Machine
• 9x21mm Ammunition (Russian)
• SR-1 Vector - Modern Firearms
• SP Ammunition - Modern Firearms

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