Lyman H&i Sizing Die .375

• Body sizing operation: Sizes cast bullets to a consistent diameter, which helps improve fit in the bore and supports more uniform accuracy with handloaded ammunition.
• Steel die construction: The steel body stands up well to repeated use on the loading bench, making it a practical choice for regular bullet sizing work.
• .375 caliber sizing: Built for .375 diameter bullets, this die supports reloaders working with larger rifle calibers where correct bullet fit is especially important.
• Standard 7/8"-14 thread: Fits common presses with a standard die thread, so it integrates easily into an established reloading setup.
• Single-die format: A straightforward way to add one specific sizing step without buying a larger set, which suits reloaders who already have the rest of their casting equipment.

About the H&i Series

Lyman H&i sizing dies are part of the company’s long-established bullet-casting and reloading range, aimed at shooters who cast their own bullets and want tighter control over finished bullet diameter. In Lyman’s lineup, these dies are practical workshop tools rather than general-purpose loading dies: they are made specifically for use in bullet sizing and lubrication workflows where dimensional consistency matters.

The series is built around a simple idea: bring cast bullets to the required final diameter while maintaining good alignment through the die. Hardened steel construction, a tapered mouth, and Lyman’s 90° hole spacing are defining features of the design. In practice, that means easier bullet entry, smoother operation during sizing and lubrication, and better support for keeping bullets cylindrical. The H&i range covers many popular rifle and pistol diameters, so reloaders can match bullet size to barrel requirements more precisely. That makes the series especially relevant for cast-bullet shooters who tune loads for accuracy, reduced leading, and dependable performance across different firearms.

About the Lyman H&i Sizing Die .375

The Lyman H&i Sizing Die .375 is a dedicated body sizing die for cast bullets, intended for reloaders who need a consistent finished diameter in the .375 class. Correct bullet diameter is a key part of cast-bullet performance, and this die is designed to help produce bullets that fit the bore more consistently. That can support better accuracy, more stable pressure behavior, and cleaner shooting with less risk of poor bullet fit.

The die uses a steel sizing body and follows Lyman’s improved H&i pattern with a tapered mouth and hardened interior. Those details matter in use because they help guide the bullet into the die more smoothly and support alignment as it is sized. The result is a more uniform cylindrical shape, which is especially important when working with cast bullets for rifle applications where small dimensional differences can show up on target.

With its standard 7/8"-14 thread, this model fits common press setups, so it is easy to integrate into an existing reloading bench. The single-die format also makes sense for reloaders who already own compatible bullet-casting equipment and only need a specific diameter die for one caliber family. For .375 bullet work, it is a focused, purpose-built tool that keeps the sizing step simple and repeatable.

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. Today, Lyman Products is headquartered in Middletown, Connecticut and focuses on equipment and accessories for shooting and reloading. 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 bench and field tasks.

Lyman’s history in this category is especially relevant because it combines sight-making heritage with a long involvement in handloading tools. The company acquired the Ideal reloading-tool business in 1925, helping establish its place in the reloading market, and its tang and receiver sights still reflect principles from William Lyman’s original sight design. That background gives the brand a well-established reputation among shooters who value traditional reloading and casting equipment.

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: 9.53 mm
• Bullet diameter: 375.00 inch

Warranty

Lyman provides a 2-year warranty for this product. This stated warranty period gives clear coverage in years for a bench tool intended for regular reloading and bullet-sizing use.