The Hornady 375 Caliber Neck Turning Mandrel (Hornady part no. 391932) supports the inside of a 375 Caliber case neck while an external cutter uniforms the neck wall thickness, a precision case-prep step known as neck turning. Made by Hornady, this mandrel is ground to the caliber’s bore diameter so the case neck sits snugly and concentrically while the cutter removes high spots in the brass. Benchrest and long-range precision shooters neck-turn brass to even out wall thickness, which improves neck concentricity and gives more consistent, predictable neck tension shot to shot. It’s a step most volume shooters skip, but one precision handloaders consider essential for their best-performing brass.

Key Specifications

• 375 Caliber is the bore diameter this mandrel is ground to match.
• Supports the case neck internally while an external cutter uniforms wall thickness.
• Improves neck concentricity for more consistent, predictable bullet tension.
• Hardened steel construction holds its precision dimension through repeated use.
• Reusable tool, not a consumable, for repeated neck-turning sessions on the same caliber.

Frequently Asked Questions

What does neck turning accomplish? It removes high spots in the case neck wall so thickness is uniform all the way around, improving concentricity and bullet tension consistency.

Do I need a separate neck-turning tool to use this mandrel? Yes, this mandrel supports the case internally while a separate neck-turning tool’s external cutter does the cutting.

Buy the Hornady 375 Caliber Neck Turning Mandrel

Order the Hornady 375 Caliber Neck Turning Mandrel from our Lubbock, Texas gun shop for fast, direct shipping to your reloading bench. Browse our full lineup of reloading equipment for the rest of your precision case-prep tools.