Wilson Expanding Mandrel Only .33 Cal .337″

The Wilson Expanding Mandrel is essential for preparing new .33 caliber brass cases for the seating operation. Designed for use with a standard 7/8" reloading press, this mandrel die ensures a consistent neck diameter, which is crucial for achieving uniform neck tension and precise seating depth. Its durable stainless parts promise a long-lasting finish, and the included L.E. Wilson manufactured lock nut provides reliable performance.

• Includes one .337" mandrel for .33 cal cases
• Interchangeable mandrels available for different calibers
• Cut-out design allows easy visual alignment
• Expands neck to slightly under bullet diameter

This die is specifically crafted to address the common issue of damaged new brass cases, ensuring optimal preparation for their first firing. Additional mandrels are sold separately, allowing for versatile use across multiple calibers.