Lyman Deburring Tool

The Lyman Deburring Tool removes burrs and creates a chamfer on both the inside and outside of a cartridge case mouth after trimming. In addition, Lyman uses precision-machined, hardened construction for the tool. As a result, it provides a straightforward hand-operated solution for preparing trimmed brass before the next stage of reloading.

Lyman Deburring Tool Features

First, use the tool on the outside of the case mouth to remove excess brass and create an even finish. Then, use the opposite cutting surface on the inside of the case mouth. Because the tool works on both surfaces, one tool handles the basic inside and outside deburring operation.

In addition, Lyman states that the tool self-centres on the case mouth. This makes the operation straightforward without requiring fine motor skills. Furthermore, the hardened construction provides a durable cutting surface for repeated case preparation.

The Lyman Deburring Tool fits cases from .17 through .45 calibre. Therefore, one tool can cover a broad range of commonly loaded rifle and handgun cartridges within that calibre range.

After trimming, deburring removes the sharp edge left around the case mouth. Next, the chamfer creates a smoother transition at the mouth before the case moves on to bullet seating. This makes the tool a useful part of a wider case-preparation process.

For powered case preparation, the Lyman Case Prep Xpress provides multiple powered case-preparation functions. Alternatively, the Lyman Case Prep Multi-Tool combines inside and outside deburring with primer-pocket cleaning and reaming in one compact hand tool.

For reloaders who need a complete trimming and preparation setup, the Lyman E-ZEE Trim Hand Case Trimming System provides case trimming, while the Lyman Universal Case Trimmer Power Pack Combo provides a powered trimming option.

For manufacturer information, see Lyman’s official Deburring Tool product page. Lyman lists the product as SKU 7810199 and specifies its .17 to .45 calibre range.

Using the Tool After Case Trimming

Before deburring, make sure the case has been trimmed and remove any loose brass or debris from the case mouth. Then, place the case mouth against the appropriate cutting surface and rotate the tool to remove the burr.

Next, work the outside of the case mouth to create an even chamfer. Afterward, use the inside cutting surface to remove the internal burr and form the inside chamfer. Because the Lyman tool handles both operations, you do not need separate standard tools for the inside and outside of the case mouth.

For routine brass preparation, use a consistent light pressure rather than forcing the cutter into the case mouth. In addition, inspect the finished case before continuing with the loading process. The goal is to remove the burr and establish a clean, even case mouth without unnecessary removal of brass.

When processing different cartridges, check that the case falls within the tool’s stated .17 to .45 calibre range. Furthermore, the same tool can be used across different cartridges within that range, making it suitable for reloaders who prepare several calibres.

For higher-volume preparation, the Lyman Case Prep Xpress can provide powered case-preparation operations. However, the hand-operated Deburring Tool remains useful when you want direct control over the case mouth during the deburring and chamfering stage.

Overall, the Lyman Deburring Tool combines inside and outside case-mouth deburring in one precision-machined, hardened tool. Therefore, it provides a simple way to finish trimmed cases before continuing with the rest of the case-preparation process.

Specifications