.30 Walker

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.30 Walker
Place of originUnited States
Production history
DesignerMark Walker
Parent case.220 Russian
Case typeRimless, bottleneck
Bullet diameter7.82 mm (0.308 in)
Neck diameter8.38 mm (0.330 in)
Shoulder diameter10.87 mm (0.428 in)
Base diameter11.15 mm (0.439 in)
Rim diameter11.2 mm (0.44 in)
Rim thickness1.5 mm (0.059 in)
Case length38.7 mm (1.52 in)
Overall length57.5 mm (2.26 in)
Rifling twist1 in 10 to 1 in 18 twist
Primer typeSmall rifle
Ballistic performance
Bullet mass/type Velocity Energy
112 gr (7 g) BIB 2,950 ft/s (900 m/s) 2,164 ft⋅lbf (2,934 J)

The .30 Walker is an intermediate cartridge developed by Mark Walker of Houston, Texas.


This cartridge is an improved version of the PPC cartridge family necked up to accept .308" bullets. The .30 Walker was designed for 100-300 yard bench rest and f-class shooting using 112-118 grain flat based bullets in slow twist rate barrels.

The .30 Walker case may be made by using Lapua 6.5 mm Grendel brass and increasing the caliber to .308 and turning the neck diameter to .330".