9×30mm Grom

The 9×30mm Grom (Гром., Russian for Thunder) is a Russian round developed between 1992 and 1993, designed for the Gepard (submachine gun), it answers the need to defeat 1B2 body armor at a range of 100 meters.

9×30mm Grom
Place of origin	Russia
Production history
Designed	1992–1993
Specifications
Parent case	9x19mm
Case type	Rimless, tapered
Bullet diameter	9.02–9.27 mm (0.355–0.365 in)
Land diameter	8.82 mm (0.347 in)value from 9x19mm
Neck diameter	9.65 mm (0.380 in)value from 9x19mm
Base diameter	9.93 mm (0.391 in)value from 9x19mm
Rim diameter	9.96 mm (0.392 in)value from 9x19mm
Rim thickness	1.27 mm (0.050 in)value from 9x19mm
Case length	30.05–30.20 mm (1.183–1.189 in)
Overall length	40.8–41.1 mm (1.61–1.62 in)
Case capacity	1.43cm3, with bullet inserted 1.11cm3
Maximum pressure	260 MPa (38,000 psi)
Filling weight	0.88- 1.05 g
Ballistic performance
Bullet mass/type Velocity Energy 6.42–6.55 g (99–101 gr) Standard 600–610 m/s (2,000–2,000 ft/s) 1,155.6–1,218.6 J (852.3–898.8 ft⋅lbf) 6.70–6.74 g (103–104 gr) Armor piercing 590–600 m/s (1,900–2,000 ft/s) 1,166.1–1,213.2 J (860.1–894.8 ft⋅lbf)
Test barrel length: Gepard (submachine gun) Source(s):

Development

A regular and an armor piercing variant were designed, the non-armor piercing bullet taken from the 9×19mm Parabellum and the armor piercing bullet was taken from the RG054 cartridge, it has a black painted tip.

The case is a stretched 9x19mm case, manufactured from phosphate varnished steel. The propellants used are pyroxylin and smokeless powder consisting of spherical ellipsoids which measure from 0.45-0.75mm, resulting in powder density of 0.95g/cm3.

See also

• 9×23mm Winchester
• 9×25mm Mauser
• 9mm Winchester Magnum
• 9×25mm Dillon – shorter but wider 9mm bottlenecked cartridge with the same capacity
• .357 Magnum – similar rimmed cartridge