.30 Walker

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

.30 Walker
Type	Rifle
Place of origin	United States
Production history
Designer	Mark Walker
Designed	2003
Specifications
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)

Description

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".

References