The Lyman M Expander Die #28 7mm (SKU: LY-MD28) is a specialized reloading tool designed to improve the accuracy, consistency, and lifespan of your 7mm rifle brass. Unlike standard expander buttons that pull through the case neck upon exit—often stretching the shoulder and causing neck distortion—the Lyman M-Die operates by pushing into the neck. This mechanical action minimizes brass fatigue and work-hardening, making it an essential addition for Australian hunters and precision shooters who want to maximize the longevity of their 7mm cartridge cases.

Key Features:

• Two-Step Expansion Process: The first step expands the inside of the case neck to slightly under bullet diameter for precise, uniform neck tension. The second step creates a small, stepped flare at the case mouth, allowing the bullet to sit perfectly centered and aligned before seating.
• Reduced Bullet Runout: By ensuring the bullet is perfectly aligned with the axis of the case neck prior to seating, this die minimizes concentricity issues and improves overall downrange accuracy.
• Extended Brass Life: Pushing into the case neck instead of pulling through prevents neck stretching and distortion, preserving the structural integrity of expensive 7mm brass.
• Enhanced Cast Bullet Compatibility: The slight flare at the case mouth prevents the sharp brass edge from shaving lead or damaging the outer diameter of cast lead bullets during the seating process.

Specifications:

• Brand: Lyman
• Model/SKU: LY-MD28
• Thread Size: Standard 7/8" x 14 threads, ensuring compatibility with all popular single-stage and turret reloading presses.
• Calibre Compatibility: Optimized for 7mm (.284 calibre) rifle cartridges, including 7mm-08 Remington, 7mm Remington Magnum, 7x57mm Mauser, and .280 Remington.
• Power Requirements: None. This is a purely manual, mechanical reloading tool requiring no electrical connection, making it fully compatible with standard Australian reloading setups.

Who It's For:

The Lyman M Expander Die #28 7mm is designed for Australian handloaders who demand the utmost precision from their 7mm rifles. It is an indispensable tool for cast bullet enthusiasts who need to eliminate lead shaving, as well as target shooters utilizing flat-base jacketed bullets that lack a boat-tail bevel and are difficult to start straight. Whether you are prepping brass for a high-country deer hunt with a 7mm-08 Remington or loading precision rounds for long-range competition with a 7mm Remington Magnum, this die ensures consistent neck tension and straight bullet seating.