Lyman H&i Sizing Die .381

• .381 sizing diameter: Brings cast bullets to a consistent final diameter, which helps improve fit in the bore and supports more uniform accuracy.
• Body sizing operation: Resizes the bullet body for proper lubrication and final dimension control, making it well suited to cast-bullet loading workflows.
• Hardened steel construction: A steel sizing die stands up to repeated use and maintains its internal dimensions over time for dependable results at the bench.
• Tapered mouth and hardened interior: This design helps guide bullets into the die more smoothly and supports alignment for a more uniform cylindrical shape.
• Standard 7/8"-14 thread compatibility: Fits common reloading press setups, so it integrates easily into established casting and bullet-sizing equipment.

About the H&I Series

Lyman H&I sizing dies are part of the company’s long-established cast-bullet tooling range, aimed at reloaders who want precise control over bullet diameter and lubrication. Within Lyman’s bullet-casting lineup, these dies are used with the firm’s lubricating and sizing equipment to bring cast bullets to a chosen final diameter while supporting a consistent application of lube. That makes the series especially relevant for shooters loading cast bullets for handgun and rifle use, where correct bullet fit has a direct effect on accuracy, fouling control and reliable chambering.

The series is built around a practical mechanical design rather than unnecessary complexity. Improved 90° hole spacing is intended to make bullet lubrication easier, including with harder lubricants, while the tapered mouth and hardened interior help guide bullets into the die and maintain alignment during sizing. Lyman also designs these dies so their interior dimensions correspond to commonly used bullet diameters across popular calibers. In use, that gives handloaders a straightforward way to match cast bullets to a firearm’s needs and keep results repeatable from batch to batch.

About the Lyman H&i Sizing Die .381

The Lyman H&i Sizing Die .381 is a single body sizing die intended for cast bullets that need a .381 final diameter. In practical terms, this makes it a useful choice for reloaders who want to fine-tune bullet fit rather than rely on as-cast dimensions alone. Proper bullet diameter matters with cast projectiles because it influences how well the bullet seals the bore, how consistently it takes the rifling and how cleanly it can be lubricated before loading. A correctly sized bullet can help reduce leading and support steadier on-target performance.

This die follows Lyman’s standard H&I pattern and uses a steel sizing body for durability under repeated bench use. The internal design includes a tapered mouth to start bullets into the die more smoothly, while the hardened interior helps preserve alignment as the bullet is sized. That is important when working with cast bullets, because maintaining a uniform cylindrical shape contributes to consistent seating and predictable performance downrange. The die also uses a standard 7/8"-14 thread, so it fits common press setups without requiring a specialized mounting arrangement.

For reloaders building cast-bullet ammunition, this is a straightforward tool focused on one job: giving bullets a repeatable finished diameter. Its single-die format suits users who already know the exact size they need and want a durable, caliber-specific component that fits naturally into a bullet-casting and lubrication workflow.

About Lyman

The Lyman Gun Sight Company began in 1878 in Middlefield, Connecticut, and the business grew from a long tradition of practical shooting equipment design. Today, Lyman Products is headquartered in Middletown, Connecticut and is known for making equipment and accessories for shooting and reloading. Its range covers core bench tools and components such as reloading dies, presses, bullet-casting equipment and gun sights, which places the brand firmly in the hands-on side of the shooting world.

That background is especially relevant for bullet sizing and casting tools, where durability, dimensional consistency and compatibility with established reloading practices matter more than unnecessary complexity. Lyman also expanded its reloading heritage when it acquired the Ideal reloading-tool business in 1925. The result is a brand with deep roots in traditional shooting and handloading equipment, and that experience carries directly into products such as H&I sizing dies for cast-bullet work.

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
• Material: Steel
• Adjustment: Standard
• Press compatibility: Standard 7/8"-14 thread
• Bullet Diameter (mm): 9.68 mm
• Bullet Diameter (inch): 381.00 inch

Warranty

2 years. Lyman states a 2-year warranty period for this product category, giving the buyer a clearly defined term of coverage.