Lyman H&i Sizing Die .379

• .379 sizing diameter: Sizes cast bullets to a consistent .379 diameter, helping maintain proper fit in the bore for more uniform accuracy and cleaner shooting.
• H&I body-sizing design: Built for use in Lyman lubricator/sizers, so sizing and lubrication can be combined in one workflow instead of separate bench steps.
• Tapered mouth: Guides bullets into the die more smoothly, which helps alignment during sizing and reduces the chance of shaving lead or distorting the bullet.
• Hardened steel construction: The steel die body resists wear from repeated use, giving reloaders a durable tool that holds its dimensions over time.
• Standard fitment: The 7/8"-14 thread compatibility makes integration straightforward with standard reloading setups where this thread pattern is used.

About the H&I Sizing Die Series

Lyman H&I Sizing Dies are part of the company’s long-established bullet-casting and reloading range, aimed at reloaders who cast their own bullets and want consistent finished dimensions before loading. Within Lyman’s lineup, these dies are practical workshop tools rather than general-purpose loading dies: their job is to bring cast bullets to a precise diameter while working with a lubricator/sizer system.

The series is built around a simple, durable design with a hardened interior and a tapered mouth that helps start bullets straight into the die. That matters in cast-bullet reloading, where preserving bullet shape is important for accuracy, bore fit and reliable lubrication. Lyman also uses 90° hole spacing in the current H&I design to make bullet lubrication easier, including with harder modern lubricants. Because the dies are offered in a wide range of diameters for popular rifle and pistol calibers, the series suits reloaders who tune bullet fit carefully for specific barrels, loads and cast alloys.

About the Lyman H&i Sizing Die .379

The Lyman H&i Sizing Die .379 is a dedicated cast-bullet sizing die for reloaders who need a finished bullet diameter of .379. In practical terms, that makes it a useful choice when bullet fit is being matched closely to a particular bore or chamber requirement, where even small diameter differences can affect accuracy, fouling and pressure behavior. Rather than treating sizing as a rough finishing step, this die supports a more controlled approach to cast-bullet preparation.

Its body-sizing configuration is intended for straightforward use in a lubricator/sizer workflow, allowing the bullet to be brought to final diameter while maintaining a clean, cylindrical form. The steel construction is important here because sizing dies see repeated contact and pressure over many loading sessions; a durable die helps keep dimensions consistent from batch to batch. Lyman’s H&I pattern also uses a tapered entry, which helps the bullet start into the die with better alignment. That reduces the risk of deforming softer cast bullets and helps preserve the shape that matters for stable flight.

For bench compatibility, the die uses a standard 7/8"-14 thread, making it easier to integrate into established reloading equipment arrangements. As a single standard die without bushings, it keeps setup simple for reloaders who want a dedicated sizing tool for one exact diameter rather than a more adjustable system.

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 reloading portfolio, and in 1925 it acquired the Ideal reloading-tool business, which helped establish its position in handloading equipment.

Today, Lyman Products is headquartered in Middletown, Connecticut and makes equipment and accessories 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 want tools from a manufacturer with experience across the full loading process. That background is directly reflected in products such as H&I sizing dies, which sit within Lyman’s long-running cast-bullet and bench-reloading tradition.

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: 9.63 mm
• Bullet diameter: 379.00 inch

Warranty

Lyman covers this product with a 2-year warranty. This stated warranty period suits a durable bench tool intended for regular reloading and bullet-sizing use.