The Mighty Armory BIG BOY Magnum Decapping Die is built specifically for reloaders working with .50 BMG, .375 CheyTac, .338 Lapua, XC cartridges, and other large magnum cases.

From the first pull of the press handle, you’ll feel the difference. The BIG BOY is all strength, perfect alignment, and repeatable performance decap after decap without fail.

The BIG BOY reloading die is precision CNC machined with 1.25 x 12 threads. The decapping shaft and pin are machined from high-grade tool steel, then heat treated and tempered for ultimate durability. 

1,000 lb Bend-Rate Steel Pins – No More Snapped Pins
Mighty Armory’s flat-tip steel decapping pins are rated to withstand up to 1,000 lbs of force, dramatically reducing bent pins and primer ringers. These pins have been proven in the field since 2017.

Perfect Vertical Alignment = Less Stress on Pins
Precision CNC machining and rigid die geometry keep the pin perfectly centered through the flash hole — less flex, fewer failures, smoother operation.

The Big Boy decapping die is pictured with an optional 1.25 to 1.50 Press Bushing Reducer if needed for your press. Bushing is not included with the decapping die.

Mighty Armory Decapping Pins are toughest in the industry. Swiss machined, rolled threads, hardened tool steel, heat treated and tempered for ultimate strength.

Construction & Engineering

• Precision CNC machined die body
• 1.25 x 12 threads for large-format presses
• Decapping shaft & pins made from hardened tool steel
• Heat treated & tempered for extreme durability
• Flat-tip pin design reduces primer ringers
• Modular, tool-free design
• Swiss-machined pins with rolled threads
• Designed for perfect vertical alignment
• Made in the USA

Compatible Cartridges

• .50 BMG
• .375 CheyTac
• .338 Lapua
• XC cases
• Other large magnum and heavy brass cases