Lyman Outside Chamfer Tool

The Lyman Outside Chamfer Tool is a precision reloading instrument designed for shooters and ammunition manufacturers who demand consistent case preparation across multiple calibers. This tool is essential for removing sharp edges from case mouths, which directly impacts bullet seating consistency and overall round integrity. Whether you're loading for precision rifle competitions or tactical training, proper case mouth chamfering is crucial for reliable chambering and accuracy.

Built with Lyman's engineering standards, the Outside Chamfer Tool features an overall length of 6.75 inches and effectively deburrs the external case mouth from .17 caliber through .45 caliber cartridges. The tool works by removing microscopic burrs created during case trimming and resizing, which can cause inconsistent bullet seating depth. Its manual operation provides tactile feedback and user control, ensuring uniform chamfer geometry without over-cutting.

Serious handloaders benefit most from this tool, particularly those working with tight-tolerance cases or shooting precision rifle platforms where case concentricity and seating consistency directly influence shot grouping. This tool complements Lyman's VLD Inside Chamfer Tool, allowing reloaders to execute complete bidirectional case mouth preparation for match-grade ammunition.