Lyman H&i Sizing Die .409

• .409 sizing diameter: Sizes cast bullets to a precise .409 diameter, helping match bullet fit to the bore for better consistency and reduced leading.
• Body sizing operation: Designed specifically for bullet body sizing, giving reloaders a straightforward way to bring cast bullets to uniform dimensions before loading.
• Hardened steel construction: The steel sizing die stands up to repeated use and helps maintain dimensional stability over long casting and reloading sessions.
• Tapered mouth and hardened interior: Lyman’s H&I die design promotes smooth bullet entry and alignment, helping preserve a true cylindrical shape during sizing.
• Standard 7/8"-14 compatibility: Fits presses with the common 7/8"-14 thread, making it easy to integrate into an established casting or reloading setup.

About the H&I Sizing Die Series

Lyman H&I Sizing Dies are part of the company’s long-established bullet-casting and cast-bullet reloading range. Built for reloaders who cast their own bullets, this series is intended to work with Lyman lube-sizing equipment to bring bullets to a controlled finished diameter while also supporting proper lubrication during the sizing process. That makes the series especially relevant for handgun and rifle shooters who want consistent bullet fit, dependable chambering, and cleaner barrel performance from cast projectiles.

A defining feature of the series is its practical mechanical design. Lyman’s improved H&I dies use 90° hole spacing to make bullet lubrication easier, including with harder modern lubricants. The dies also use a tapered mouth and a hardened interior to guide bullets into alignment and help maintain a uniform cylindrical form as they pass through the die. Rather than serving as a general-purpose reloading die, the H&I series is purpose-built for cast-bullet sizing, where exact diameter control has a direct effect on accuracy, fouling control, and overall load consistency.

About the Lyman H&i Sizing Die .409

The Lyman H&i Sizing Die .409 is a dedicated cast-bullet sizing die for reloaders who need a finished bullet diameter of .409. In cast-bullet shooting, correct bullet fit is one of the main factors behind stable accuracy and reduced barrel leading, so a die matched to the intended diameter is more than a convenience; it is a core part of producing uniform ammunition. This model is therefore best suited to handloaders who already know the diameter their firearm and bullet alloy combination requires and want repeatable results from batch to batch.

Its body sizing function focuses on bringing the bullet shank to a consistent dimension, which helps bullets seat more uniformly and behave more predictably in the bore. The steel construction supports long service life in regular workshop use, while the standard adjustment layout keeps setup straightforward for experienced reloaders. Because it uses the common 7/8"-14 thread, it fits readily into standard press-based setups without the need for special mounting arrangements.

As part of Lyman’s H&I system, this die also benefits from the series design features that matter in practice: a tapered entry that helps start bullets smoothly, a hardened interior that supports alignment, and geometry intended to preserve a true cylindrical bullet shape. For cast-bullet shooters, those details translate into more consistent finished bullets and a more controlled sizing process.

About Lyman

The Lyman Gun Sight Company began in 1878 in Middlefield, Connecticut, and the brand has remained closely tied to shooting and reloading equipment ever since. Lyman Products is headquartered in Middletown, Connecticut, and its core expertise covers tools and accessories for handloaders and shooters rather than general outdoor equipment.

The company is particularly well known for making reloading dies, presses, bullet-casting equipment, and gun sights, which places it in a strong position for products such as cast-bullet sizing dies. Lyman’s history also includes the 1925 acquisition of the Ideal reloading-tool business, a step that helped establish its long presence in the reloading field. Over time, the company expanded further, with Pachmayr joining the Lyman family in 1996. That background gives Lyman a long-standing reputation for practical workshop tools built for shooters who load and tune their own ammunition.

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: 10.39 mm
• Bullet diameter (inch): 409.00 inch

Warranty

2 years. Lyman states a 2-year warranty for this product, covering defects in materials and workmanship under normal use.

In the Box

• Lyman H&I Sizing Die .409