Hornady Neck Turn Mandrel .338

Hornady Neck Turn Mandrel .338

The Hornady Neck Turn Mandrel .338 is a caliber-specific mandrel for Hornady neck-turning tools. It supports consistent case positioning during neck turning and measures 0.336 inch in diameter. Hornady lists this mandrel for 338 Cal. applications under part number 391930.

The mandrel fits the neck-turning setup and supports cases during the cutting operation. During use, the case slides over the mandrel while the tool holds the case in position. This allows the cutter to remove material from the case neck in a controlled manner. As a result, the mandrel helps maintain consistent alignment throughout the neck-turning process.

For a powered setup, the mandrel works with the Hornady L&L Neck Turn Tool. The manual Hornady Hand Neck Turn Tool provides another compatible option for case preparation. Both tools use caliber-specific mandrels, so the correct diameter must match the intended application.

338 Caliber Case Preparation

The Hornady Neck Turn Mandrel .338 has a 0.336-inch diameter and carries Hornady part number 391930. Hornady’s current mandrel range also includes options for 17, 20, 22, 25, 6mm, 6.5mm, 270, 7mm, 8mm, 30, 35 and 375 caliber applications.

The .338 mandrel is not the complete neck-turning tool. It provides the case-supporting mandrel for the 338 Cal. application, while the selected neck-turning tool provides the adjustment and cutting mechanism. Therefore, check that the appropriate Hornady tool is available before adding this mandrel to a case-preparation setup.

The 0.336-inch mandrel diameter is a manufacturer specification rather than a generic .338-inch measurement. This distinction matters when selecting the correct replacement or additional mandrel for a particular neck-turning tool.

Specifications

• Manufacturer: Hornady
• Product: 338 Cal. Neck Turn Mandrel
• Manufacturer part number: 391930
• Diameter: 0.336 inch
• Application: 338 Cal. case neck turning
• Compatible equipment: Hornady Neck Turn Tool and Hand Neck Turn Tool
• Type: Caliber-specific mandrel
• Neck-turning tool: Sold separately

For further technical information, see Hornady’s official Neck Turn Tool information.