Miniature European parlor/training cartridge; the smallest commercially produced Flobert cartridge, used in indoor gallery pistols and training arms.
Type: Rimfire
Introduced: 1880, Germany
Parent case: Flobert cap (primer only)
Standardization: Proprietary
Bullet diameter: 0.158" (4 mm)
Rim type: Rimmed
Primer: Rimfire
Production status: Active
Also known as: 4mm RF · 4mm Randfeuer · No.4 Flobert · 4mm Flobert RF
History: The 4mm Flobert is the smallest commercially produced Flobert cartridge, used in European salon pistols and training arms. Like all Flobert cartridges it uses only the primer compound as propellant. Still produced in limited quantities by European makers for collector arms and indoor gallery use.