Lyman H&i Sizing Die .512

• .512 sizing diameter: This H&I sizing die is made for .512 inch bullets, helping cast-bullet reloaders bring bullets to a consistent final diameter for better fit in the bore and more uniform on-target results.
• Body sizing operation: The die is built for straightforward sizing work, making it a practical choice when the goal is to produce bullets with a controlled, repeatable diameter before loading.
• Steel construction: A steel sizing die stands up well to repeated use on the bench and maintains the dimensional stability needed for consistent bullet shaping over time.
• Tapered, hardened die design: Lyman H&I sizing dies use a tapered mouth and hardened interior to guide bullets into the die more smoothly and help maintain proper alignment during sizing.
• 90° lube-hole spacing: The improved H&I design uses 90° hole spacing to make bullet lubrication easier, especially when working with harder lubricants in a lube-sizer setup.

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 cast their own bullets and want a simple, repeatable way to bring bullet diameter into line with the needs of a specific firearm and load. In Lyman’s lineup, the H&I series sits as a core component for use with the company’s bullet sizing and lubricating equipment, especially for shooters who want more control over cast-bullet preparation than bulk, one-size-fits-all components can offer.

The series is built around practical workshop use rather than complex adjustment systems. Tapered die mouths help start bullets into the die smoothly, while a hardened interior supports alignment and helps maintain a consistent cylindrical shape during sizing. Lyman also uses 90° hole spacing in the improved H&I design, which aids lubricant flow when sizing cast bullets with modern hard lubes. With diameters covering many popular rifle and pistol calibers, the H&I family is aimed at reloaders who value fit, consistency and dependable bench operation in cast-bullet ammunition.

About the Lyman H&i Sizing Die .512

The Lyman H&i Sizing Die .512 is a dedicated bullet sizing die for reloaders working with .512 inch cast bullets. In practical terms, this die is about controlling one of the key variables in cast-bullet ammunition: final bullet diameter. A properly sized cast bullet can improve bore fit, support cleaner shooting and help produce more consistent accuracy, especially in loads where bullet-to-barrel fit matters as much as powder charge or alloy choice.

This model uses steel construction and a standard adjustment format, giving it the straightforward, durable feel expected from traditional reloading tools. Its standard 7/8"-14 thread compatibility makes it easy to integrate into common press setups where that thread pattern is used, so it fits naturally into an established handloading bench. As a single standard die with body sizing operation, it is focused on one task and does it without unnecessary complication.

Like other dies in the H&I family, this model benefits from Lyman’s improved design details, including a tapered entry and hardened interior that help guide bullets into alignment as they are sized. That matters when working with cast bullets, because preserving a uniform cylindrical shape is essential for even seating, predictable pressure and stable downrange performance. For reloaders building cast-bullet loads in larger diameters, this die provides a dedicated, repeatable sizing solution within Lyman’s bullet-casting system.

About Lyman

The Lyman Gun Sight Company began in 1878 in Middlefield, Connecticut, giving the brand a long history in shooting equipment. Lyman Products is headquartered in Middletown, Connecticut, and the company focuses on tools and accessories for shooters and reloaders. Its range includes reloading dies, presses, bullet-casting equipment and gun sights, which makes Lyman particularly relevant to handloaders building ammunition around cast bullets and traditional bench processes.

Over time, the company expanded its reloading presence through key additions, including the acquisition of the Ideal reloading-tool business in 1925. Lyman’s sight products also continue to reflect the principles of William Lyman’s original sight design, showing the brand’s long connection to practical shooting hardware. That combination of reloading equipment, casting tools and shooting accessories gives Lyman a well-established place among manufacturers serving reloaders who want dependable, workshop-oriented tools.

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
• Adjustment: Standard
• Press compatibility: Standard 7/8"-14 thread
• Bullet diameter: 13.00 mm
• Bullet diameter: 512.00 inch

Warranty

Lyman provides a 2-year warranty for this product. That period suits a bench tool intended for regular reloading and bullet-sizing use.