Lyman MSR Precision .458 SOCOM 4-Die Set with Case Headspace Gauge

The Lyman MSR Precision .458 SOCOM 4-Die Set with Case Headspace Gauge is a purpose-built rifle reloading die system designed for reloaders producing reliable .458 SOCOM ammunition for AR-15 and modern sporting rifle platforms. Engineered specifically for semi-automatic operation, this die system supports proper case sizing, neck expansion, bullet seating, and taper crimping while ensuring correct shoulder setback and chambering reliability for gas-operated rifles.

Quick Highlights:

• Product Type: Rifle Reloading Die System
• Caliber: .458 SOCOM
• Die Configuration: 4-Die Set with Case Headspace Gauge
• Included Dies: Full Length Sizing/Decapping, Powder Through Expanding, Bullet Seating, Taper Crimp
• Press Compatibility: Standard 7/8″-14 Reloading Presses
• Material: Precision Machined Hardened Steel
• Application: Semi-automatic rifle cartridge reloading

Use Cases & Applications:

• Reloading ammunition for .458 SOCOM AR-15 rifles
• Producing big-bore hunting ammunition for modern sporting rifles
• Developing subsonic and full-power .458 SOCOM handloads
• Reloading once-fired .458 SOCOM brass for AR-platform reliability
• Building consistent ammunition for large-bore AR hunting or defensive use

Design & Functional Advantages:

• Full length sizing die restores case body dimensions and sets correct shoulder position for semi-automatic reliability
• Powder-through expanding die prepares case mouths for large-diameter .458 bullets
• Precision seating die supports consistent bullet seating depth for uniform cartridge assembly
• Taper crimp die applies a controlled crimp to improve feeding and bullet retention
• Included case headspace gauge allows reloaders to verify proper sizing during die setup
• Hardened steel construction provides durability and repeatable performance across reloading cycles

Technical Details:

Manufacturer: Lyman
Product Type: Rifle Reloading Die System
Caliber: .458 SOCOM
Die Configuration: 4-Die Set with Gauge
Included Dies: Full Length Sizing/Decapping, Powder Through Expanding, Bullet Seating, Taper Crimp
Thread Size: 7/8″-14
Material: Hardened Steel
Press Compatibility: Standard Reloading Presses
Included Tool: .458 SOCOM Case Headspace Gauge