Lyman H&i Sizing Die .406

• Correct .406 sizing diameter: Brings cast bullets to a consistent .406 diameter, which helps maintain uniform bore fit and supports more predictable accuracy with cast-bullet loads.
• Body sizing for cast bullets: Designed for the sizing stage in a lubricator/sizer workflow, so bullets can be brought to final diameter while staying properly shaped for reliable loading and shooting.
• Hardened steel construction: The steel die body resists wear from repeated use, giving reloaders a durable tool that holds its dimensions over time.
• Tapered mouth and hardened interior: Lyman’s H&I die design helps guide bullets into the die more smoothly and keeps them aligned, which supports a more uniform cylindrical result.
• Standard fit for Lyman systems: Built for standard Lyman H&I sizing use, making it a practical choice for reloaders who want to match bullet diameter to a specific cast-bullet application.

About the H&I Sizing Dies Series

Lyman H&I Sizing Dies are part of the company’s long-established cast-bullet reloading range. They are intended for reloaders who cast their own bullets and need a precise way to bring those bullets to final diameter before use. Within Lyman’s lineup, this series sits alongside the brand’s bullet-casting, lubrication and sizing equipment, and it is built around practical workshop use rather than high-volume progressive loading.

The series is designed to work with Lyman lubricator/sizer equipment, where the die sizes the bullet and supports proper lubrication during the process. Lyman’s current H&I die pattern uses 90° hole spacing to improve lubricant flow, including with harder modern bullet lubes. The dies also use a tapered mouth and a hardened interior to help start bullets straight and maintain a consistent cylindrical shape through the sizing stroke. That makes the series especially relevant for cast-bullet shooters who want repeatable bullet fit, controlled lubrication and dependable results across common rifle and pistol calibers.

About the Lyman H&i Sizing Die .406

The Lyman H&i Sizing Die .406 is a single body sizing die made for cast bullets that need to be finished to .406 diameter. In cast-bullet reloading, bullet fit is critical: a bullet that is sized consistently is easier to match to the firearm’s bore and intended load, which can help support cleaner shooting and steadier accuracy. This die is therefore a practical tool for reloaders who want control over the final dimensions of their bullets rather than relying on as-cast diameter alone.

Its steel construction suits repeated bench use, while the standard H&I geometry helps the bullet enter the die smoothly and stay aligned during sizing. That matters because a well-guided bullet is less likely to be distorted during the operation, preserving a uniform cylindrical profile. The die is built as a standard type with standard adjustment, making it straightforward to integrate into an established cast-bullet workflow. For reloaders using compatible Lyman sizing equipment, this model offers a simple, caliber-specific way to produce bullets at the required final diameter for consistent handling, seating and downrange performance.

About Lyman

The Lyman Gun Sight Company began in 1878 in Middlefield, Connecticut, and the business grew from sight-making into a broader specialist in shooting and reloading equipment. Today, Lyman Products is headquartered in Middletown, Connecticut and is known for making tools and accessories for handloaders and shooters. Its range includes reloading dies, presses, bullet-casting equipment and gun sights, which places the company in a strong position for reloaders who want one brand across several stages of the loading process.

Lyman’s history in this category is especially relevant because it also acquired the Ideal reloading-tool business in 1925, helping establish its long presence in handloading equipment. That background shows in products such as cast-bullet sizing dies, where the emphasis is on practical workshop tools built for repeatable results rather than unnecessary complexity.

Main Features

• Manufacturer: Lyman
• Made in: USA
• Die operation: Body sizing
• Pack size: Single
• Die type: Standard
• Bushing: No
• Case type: Universal
• Sizing die material: Steel
• Adjustment: Standard
• Press compatibility: Standard 7/8"-14 thread
• Bullet diameter: 10.30 mm
• Bullet diameter: 406.00 inch

Warranty

2 years. Lyman states a 2-year warranty period for this product.