.30 Walker

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.30 Walker
Type Rifle
Place of origin United States
Production history
Designer Mark Walker
Designed 2003
Parent case .220 Russian
Case type Rimless, bottleneck
Bullet diameter 7.82 mm (0.308 in)
Neck diameter 8.38 mm (0.330 in)
Shoulder diameter 10.87 mm (0.428 in)
Base diameter 11.15 mm (0.439 in)
Rim diameter 11.2 mm (0.44 in)
Rim thickness 1.5 mm (0.059 in)
Case length 38.7 mm (1.52 in)
Overall length 57.5 mm (2.26 in)
Rifling twist 1 in 10 to 1 in 18 twist
Primer type Small 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".