Lyman H&i Sizing Die .355

• .355 sizing diameter: This die sizes cast bullets to .355 / 9.02 mm, helping maintain the correct fit for 9 mm-class applications and supporting more consistent accuracy.
• Body sizing operation: The die is built for straightforward bullet body sizing, making it a practical choice for reloaders who want uniform bullet dimensions before loading.
• Hardened steel construction: A steel sizing die stands up well to repeated use on the bench and keeps its internal dimensions stable over time.
• Standard 7/8"-14 thread: The common press thread makes installation simple on compatible reloading equipment and helps integrate the die into an existing setup.
• Made in the USA: Domestic manufacture and Lyman’s long reloading background make this die a dependable fit for established casting and sizing workflows.

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 precise control over final bullet diameter. In Lyman’s lineup, these dies sit alongside lubricating and sizing tools used to prepare cast bullets for reliable loading and repeatable on-target performance. The series is built around a simple purpose: bring cast bullets to a consistent finished diameter while supporting proper alignment during the sizing process.

What distinguishes the series is its focus on practical bench use. Lyman describes these dies as having 90° hole spacing for easier bullet lubrication, along with a tapered mouth and a hardened interior that help guide bullets into the die and maintain a uniform cylindrical shape. That makes the H&I series especially relevant for reloaders working with cast pistol and rifle bullets, where small changes in bullet diameter can affect chambering, bore fit and accuracy. Rather than adding complexity, the series emphasizes durable materials, straightforward compatibility and repeatable results in routine sizing work.

About the Lyman H&i Sizing Die .355

The Lyman H&i Sizing Die .355 is intended for reloaders who cast bullets and need a finished diameter of .355 inch. In practical terms, that makes it a useful tool when bullet fit must be controlled closely for consistent loading and predictable performance. A correctly sized cast bullet can help reduce variation from round to round, and that matters whether the goal is economical practice ammunition or carefully assembled handgun loads.

This model uses a body sizing configuration and a standard adjustment layout, so it fits naturally into a conventional reloading workflow without adding unnecessary setup complexity. Its steel construction is important in use because the die must resist wear while preserving its internal dimensions through repeated sizing cycles. The standard 7/8"-14 thread also broadens compatibility with common presses, which is valuable for reloaders who already have an established bench setup and want to add bullet sizing capability without changing equipment.

As part of Lyman’s H&I system, this die is designed for cast-bullet preparation rather than cartridge case sizing. That distinction matters: the tool is focused on producing a uniform bullet body diameter, which supports smoother downstream lubrication and loading steps. For shooters who rely on cast bullets, the .355 version fills a very specific role, giving them a direct way to match bullet diameter to the needs of their chosen load and firearm.

About Lyman

The Lyman Gun Sight Company began in 1878 in Middlefield, Connecticut, and the brand has remained closely tied to the needs of shooters and reloaders ever since. Lyman Products is headquartered in Middletown, Connecticut, and the company is known for making equipment and accessories for shooting and reloading. Its range includes reloading dies, presses, bullet-casting equipment and gun sights, which places Lyman among the established names for handloading tools in the United States.

The company’s history in this field is long and practical rather than broad and generic. Lyman acquired the Ideal reloading-tool business in 1925, strengthening its position in reloading equipment, and its product families continue to reflect that specialization. For bullet casters and reloaders, Lyman is especially associated with the tools needed to size, lubricate, cast and assemble ammunition with repeatable bench results.

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: 9.02 mm
• Bullet diameter (inch): 355.00 inch

Warranty

2 years. This Lyman sizing die is covered by a 2-year warranty, making it a practical choice for regular bench use in bullet-casting and reloading work.