Lyman H&i Sizing Die .427

• .427 sizing diameter: Sizes cast bullets to a consistent .427 diameter, helping maintain proper fit in the bore for steadier accuracy and more uniform pressure.
• Body sizing operation: This die is built specifically for bullet body sizing, making it a practical choice for reloaders who want a straightforward tool for cast-bullet finishing.
• Hardened steel construction: The steel sizing body stands up to repeated use on the bench and helps keep the die dimensionally stable over time.
• Tapered, alignment-focused design: Lyman H&I sizing dies use a tapered mouth and hardened interior to guide bullets into the die more smoothly and help preserve a true cylindrical shape.
• Standard 7/8"-14 compatibility: The standard thread pattern fits common reloading press setups, so it integrates easily into an established casting and sizing workflow.

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 equipment range. Designed for use with Lyman lubricating and sizing setups, this series focuses on one of the key steps in cast-bullet preparation: bringing bullets to a precise final diameter while supporting consistent lubrication and alignment. That makes the H&I line especially relevant to handloaders who cast their own bullets for handgun and rifle cartridges and want repeatable fit from batch to batch.

Across the series, the emphasis is on caliber-specific sizing, durable steel construction, and geometry that supports smooth entry into the die. Lyman describes these dies with a tapered mouth and a hardened interior, features that help guide bullets into place and maintain a proper cylindrical form during sizing. The improved hole spacing used in the series also supports easier bullet lubrication, particularly when working with harder lubes. In practical terms, the H&I range is aimed at reloaders who value controlled bullet diameter, dependable bench operation, and compatibility with established cast-bullet loading routines.

About the Lyman H&i Sizing Die .427

The Lyman H&i Sizing Die .427 is a dedicated bullet-sizing die for reloaders working with cast bullets that need a final diameter of .427. In cast-bullet shooting, correct bullet fit is critical: a bullet that matches the intended bore and load combination more closely can help reduce gas cutting, support cleaner engagement with the rifling, and improve consistency on target. This makes a caliber-specific sizing die like this one an important finishing tool rather than a minor accessory.

Its body sizing configuration keeps the job focused and simple, making it suitable for reloaders who already have an established lubrication and sizing process and need a precise die for this diameter. The steel construction is well suited to repeated workshop use, while the standard adjustment format keeps setup familiar for users of conventional reloading equipment. With standard 7/8"-14 thread compatibility, the die fits common press arrangements without requiring a specialized mounting standard.

Lyman’s H&I design also adds practical value beyond the raw diameter. The tapered mouth helps bullets start into the die more smoothly, and the hardened interior supports alignment as the bullet is sized. That matters because a sizing die should not only reduce diameter, but do so evenly. For handloaders producing cast ammunition in volume or tuning loads for reliable fit, the Lyman H&i Sizing Die .427 is a purpose-built tool for repeatable bullet preparation.

About Lyman

The Lyman Gun Sight Company began in 1878 in Middlefield, Connecticut, and the brand has long been associated with practical tools for shooters and reloaders. Its product range includes reloading dies, presses, bullet-casting equipment, and gun sights, giving the company a broad presence across both ammunition preparation and shooting accessories. That background is especially relevant for cast-bullet and reloading tools, where bench equipment needs to work as part of a complete system rather than as a standalone item.

Lyman later expanded its reloading role by acquiring the Ideal reloading-tool business in 1925, helping establish the company as a familiar name in handloading equipment. Today, Lyman Products is headquartered in Middletown, Connecticut, and continues to make equipment and accessories for shooting and reloading. For products such as bullet sizing dies, that long specialization shows in a product line built around established workshop standards and compatibility with traditional reloading practices.

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
• Material: Steel
• Adjustment: Standard
• Press compatibility: Standard 7/8"-14 thread
• Bullet diameter: 10.85 mm
• Bullet diameter: 427.00 inch

Warranty

Lyman provides a 2-year warranty for this sizing die. This stated warranty period covers the product for a defined term and is suitable for buyers who want a clearly specified manufacturer warranty in years.