RCBS Lube-A-Matic Calibration Die .358

• Precision bullet sizing: The .358.00 inch calibration die brings cast bullets to a consistent finished diameter, which helps support uniform chambering, steadier pressure, and more repeatable downrange results.
• Lube-and-size operation: Built for the RCBS Lube-A-Matic system, this die sizes the bullet while lubricant is applied to the grease grooves, reducing separate handling steps at the loading bench.
• Useful for cast-bullet reloaders: Proper bullet fit matters in cast-bullet shooting, and a dedicated sizing die helps match bullet diameter to the intended application for cleaner performance and dependable feeding.
• Simple bench integration: As a purpose-built accessory for bullet sizing equipment, it fits naturally into an established cast-bullet workflow without adding unnecessary complexity.
• Made in the USA: RCBS manufactures this die in the USA, reflecting the brand’s long focus on durable reloading tools and replacement parts for regular bench use.

About the Lube-A-Matic Series

The RCBS Lube-A-Matic series is built for reloaders who cast their own bullets and want a practical way to combine sizing and lubrication in one bench operation. Within the RCBS lineup, these tools sit in the bullet-casting and bullet-preparation segment, serving handloaders who need more control over bullet fit than jacketed-bullet loading typically requires. The system is centered on the idea that cast bullets perform best when they are brought to a consistent diameter and lubricated correctly for the intended velocity range and application.

A defining characteristic of the Lube-A-Matic family is its modular approach. The sizer/lubricator works with caliber-specific dies and matching top punches, allowing the user to configure the tool around different bullet diameters and nose profiles. That makes the series especially relevant for reloaders working across multiple handgun and rifle calibers. In practical terms, the design helps streamline cast-bullet preparation, keeps the process repeatable, and supports the kind of consistency that matters when assembling ammunition for regular range use, hunting loads, or careful load development.

About the RCBS Lube-A-Matic Calibration Die .358

The RCBS Lube-A-Matic Calibration Die .358 is intended for cast-bullet reloaders who need a finished bullet diameter of .358.00 inch. In cast-bullet loading, diameter is not a minor detail; it directly affects how the bullet fits the bore, how smoothly it chambers, and how consistently it performs from shot to shot. A dedicated calibration die like this one helps produce bullets with a uniform final size, which is especially important when building ammunition in quantity or refining a load for a specific firearm.

Used with the RCBS Lube-A-Matic Bullet Sizer/Lubricator, this die supports a combined sizing and lubricating process. That saves time compared with handling those steps separately and helps keep the workflow organized at the bench. As the bullet is sized, lubricant is applied to the grease grooves, which is a practical advantage for cast-bullet shooters looking to maintain smooth operation and consistent preparation standards. For reloaders working with .35-caliber cast bullets, the .358 die is a straightforward way to set up the Lube-A-Matic for repeatable output.

The die’s role is specialized, but that specialization is exactly its value. Rather than serving as a general-purpose accessory, it is made for one specific bullet diameter and one specific stage of the reloading process. That focused design makes it useful for handloaders who want predictable results, cleaner process control, and a bullet-sizing setup matched to their chosen caliber.

About RCBS

RCBS was founded in 1943 by Fred T. Huntington in Oroville, California. The company name came from Rock Chuck Bullet Swage, the original bullet-swaging die that launched the brand. From those beginnings, RCBS developed into a specialist in ammunition handloading and reloading equipment for both rifle and pistol cartridges.

Today, RCBS is known for a broad range of bench equipment, including presses, dies, shell holders, powder measures, and priming tools. Its catalog covers single-stage, turret, and progressive reloading systems, reflecting a long-standing focus on practical tools for everyone from occasional handloaders to experienced reloaders with more advanced workflows. That background makes RCBS a natural fit for products such as bullet-sizing accessories, where repeatability, compatibility, and durable construction matter more than unnecessary complexity.

Main Features

• Manufacturer: RCBS
• Made in: USA
• Accessories for: Case preparation
• Color: Silver
• Bullet Diameter (inch).: 358.00 inch

Warranty

2 years. RCBS states a 2-year warranty for this product, covering defects in materials and workmanship for the stated period from the date of purchase.