The Lyman Neck Expanding "M" Die for .22 Hornet is a calibre-specific reloading die designed to uniform case necks and enable precise projectile seating. Built with an industry-standard 7/8"-14 thread interface, this unpowered mechanical tool expands the internal neck diameter without stretching the brass or distorting the shoulder, eliminating the lead shaving and jacket damage common with standard expander balls.

Key Features

• Two-Step Expanding Mandrel: The first step expands the inside of the case neck to slightly below projectile diameter for consistent neck tension, while the second step opens the case mouth to exact bullet diameter to seat projectiles square and perfectly centred.
• Adjustable Mouth Flare: Adjusting the die body depth provides an optional gentle flare, allowing flat-base, cast, or coated bullets to enter the case mouth smoothly without resistance.
• Brass Protection: Replaces conventional pull-through expander balls to prevent crushed shoulders, neck buckling, and case stretching on fragile brass cases.
• Standard Press Compatibility: Features 7/8"-14 threading to fit standard single-stage, turret, and progressive reloading presses.

Specifications

• Brand: Lyman Products
• Model / MPN: LY-MD22H / 7349058
• Calibre Compatibility: .22 Hornet
• Thread Interface: 7/8"-14 thread
• Operation: Mechanical (unpowered)

Who is the Lyman M Expander Die 22 Hornet for?

• Cast lead and poly-coated bullet reloaders — requires a two-step expanding mandrel configured for .22 Hornet brass in standard 7/8"-14 thread presses to create a uniform neck pocket that seats flat-base lead and coated projectiles without shaving outer material.
• Handloaders seeking to prevent case damage — prevents crushed shoulders and neck buckling on thin-walled .22 Hornet cases by expanding the case neck mouth from the top down rather than using standard upward pull-through expander balls.

Less suitable for: Handloaders reloading longer .22 calibre cases such as .223 Remington or .22-250 Remington, which exceed the stroke depth of this dedicated short-case die body and require a standard-length .22 calibre rifle expanding die.