Lyman H&i Sizing Die .410

• .410 sizing diameter: This H&I sizing die is made for .410 in / 10.40 mm bullets, helping cast bullets reach a consistent final diameter for better fit in the bore and more predictable accuracy.
• Body sizing function: The die is built for body sizing, reducing bullet diameter evenly so cast bullets feed, chamber and shoot more consistently after lubrication and sizing.
• Hardened steel construction: Its steel sizing body stands up to repeated use and helps maintain dimensional consistency over long loading sessions.
• Tapered, alignment-focused design: Lyman H&I sizing dies use a tapered mouth and hardened interior to guide bullets into the die smoothly and help preserve a uniform cylindrical shape.
• Standard press fit: The 7/8"-14 thread compatibility makes it easy to use with common loading equipment, so it integrates into established bullet-casting and sizing setups.

About the H&I Series

Lyman H&I sizing dies are part of the company’s long-established bullet-casting and cast-bullet reloading range. They are intended for reloaders who want to bring cast bullets to a precise finished diameter while using a lubricator-sizer system, especially for handgun and rifle bullets where correct fit has a direct effect on accuracy, fouling control and reliable chambering. Within Lyman’s lineup, the H&I series serves as the caliber-specific sizing component used with the company’s lubricating and sizing equipment.

The series is built around a practical design: a tapered entry helps start the bullet straight, while a hardened interior supports smooth sizing and helps maintain a consistent cylindrical form. Lyman also uses 90° hole spacing in these improved dies to make bullet lubrication easier, including with harder modern lubricants. The result is a straightforward tool family aimed at reloaders who cast their own bullets and want repeatable bullet dimensions without unnecessary complexity. In use, H&I dies support the core goals of cast-bullet loading: proper bullet fit, dependable handling in the loading process and more uniform downrange performance.

About the Lyman H&i Sizing Die .410

The Lyman H&i Sizing Die .410 is a caliber-specific bullet sizing die for reloaders working with .410 in / 10.40 mm cast bullets. Its role is simple but important: it brings cast bullets to a controlled final diameter so they can better match the firearm’s bore and deliver more consistent results on target. For cast-bullet shooters, that matters not only for accuracy, but also for smoother loading and more predictable bullet performance.

As a body sizing die, this model is designed to size the bullet evenly rather than perform multiple operations. That makes it a focused tool for bullet casters who already know the diameter they need and want a dedicated die for that task. The steel construction is well suited to repeated bench use, while the standard 7/8"-14 thread allows the die to fit common press setups without special adapters. In practice, that means easier integration into an existing reloading bench and less time spent adapting equipment.

Like other dies in the H&I family, this model benefits from Lyman’s sizing-die design with a tapered mouth and hardened interior. Those details help the bullet enter the die more smoothly and stay aligned during sizing, which supports a more uniform finished shape. For reloaders who cast and size their own bullets, this .410 die is a specialized but useful tool for producing ammunition with more consistent bullet dimensions.

About Lyman

The Lyman Gun Sight Company began in 1878 in Middlefield, Connecticut, and the brand has long been associated with practical equipment for shooters and reloaders. Over time, Lyman expanded beyond sights into a broader loading and casting portfolio, and Lyman acquired the Ideal reloading-tool business in 1925, which helped establish its place in metallic reloading tools and accessories.

Today, Lyman Products is headquartered in Middletown, Connecticut and focuses on equipment for shooting and reloading. Its range includes reloading dies, presses, bullet-casting equipment and gun sights, which makes the brand especially relevant to reloaders who build cast-bullet ammunition from start to finish. That long involvement in both sighting products and handloading tools gives Lyman a practical reputation among shooters who value established, workshop-oriented designs.

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: 10.40 mm
• Bullet diameter: 410.00 inch

Warranty

2 years. Lyman states a 2-year warranty for this product, covering the die for the specified period from the manufacturer.