Lyman H&i Sizing Die .408

• Cast bullet sizing for .408 diameter: This H&I sizing die brings cast bullets to a consistent .408 diameter, which helps support uniform fit in the bore and more repeatable accuracy.
• Body sizing operation: The die is built specifically for bullet body sizing, making it a practical choice for reloaders who want to control final bullet dimensions before loading.
• Hardened steel construction: A steel sizing die stands up well to repeated use and helps maintain dimensional consistency over long loading sessions.
• Tapered mouth and hardened interior: Lyman’s H&I die design promotes smoother bullet entry and better alignment, helping the bullet keep a more uniform cylindrical shape during sizing.
• Standard 7/8"-14 thread compatibility: The die fits presses with the common 7/8"-14 thread pattern, so it integrates easily into many established reloading setups.

About the H&I Sizing Die Series

Lyman H&I Sizing Dies are part of the company’s long-established cast bullet reloading and bullet-casting range. They are intended for reloaders who cast their own bullets and want tighter control over final bullet diameter before loading. In practical use, that matters because cast bullet performance depends heavily on matching bullet size to the firearm and load, especially when consistency and clean lubrication are priorities.

The series is designed to work with Lyman lube/sizing equipment, combining bullet sizing with the lubrication process in a straightforward workshop routine. Lyman describes these dies with a tapered mouth and a hardened interior, features that help guide the bullet into the die and support a more uniform cylindrical result. The improved design also uses 90° hole spacing to make bullet lubrication easier, including with harder modern lubricants. That makes the H&I series a practical fit for reloaders who value repeatable bullet preparation, broad caliber availability, and compatibility with established cast bullet workflows.

About the Lyman H&i Sizing Die .408

The Lyman H&i Sizing Die .408 is a single body sizing die made for cast bullets that need to be brought to a final diameter of .408. In cast bullet reloading, that final sizing step is important because it affects how consistently the bullet fits the bore, accepts lubricant, and behaves during loading and firing. A dedicated die like this gives the reloader a simple way to standardize bullet dimensions rather than relying on as-cast variation.

This model uses a steel construction and a standard adjustment format, keeping the setup familiar for reloaders who already work with conventional press tooling. Its 7/8"-14 thread compatibility also makes integration easier on common presses. In practice, that means the die can become part of an existing bench setup without requiring a specialized mounting standard.

As part of Lyman’s H&I system, the die benefits from the series design features that support alignment and lubrication. The tapered mouth helps start the bullet into the die more smoothly, while the hardened interior helps preserve the die’s working dimensions over repeated use. For reloaders producing cast bullets for .408 caliber applications, this die is a focused tool for achieving consistent finished diameter and a more uniform bullet preparation process.

About Lyman

The Lyman Gun Sight Company began in 1878 in Middlefield, Connecticut. Over time, Lyman expanded from sight-making into a broader shooting and reloading equipment business, and it is now especially well known for tools and accessories used at the loading bench. Its product range includes reloading dies, presses, bullet-casting equipment, and gun sights, which makes the brand closely associated with both ammunition preparation and traditional shooting accessories.

Lyman Products is headquartered in Middletown, Connecticut, and its long presence in reloading helps explain the practical, workshop-oriented design of products such as cast bullet sizing tools. The company also acquired the Ideal reloading-tool business in 1925, a notable part of its history in handloading equipment. That background gives Lyman a strong connection to reloaders who want established tooling for case preparation, bullet casting, and bullet sizing.

Main Features

• Manufacturer: Lyman
• Made in: USA
• Category: Bullet Sizing
• 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: 10.36 mm
• Bullet diameter (inch): 408.00 inch

Warranty

Lyman states a 2-year warranty for this product. This covers defects in materials and workmanship under the manufacturer’s stated warranty terms.