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9×30mm Grom

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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): ^[1]

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. ^[2]^[1]

Development[edit]

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.^[1]

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.^[1]