The Hornady Neck Turning Tool Mandrel .30 Caliber (MPN: 391928) is a dedicated reloading pilot engineered specifically for the Hornady Neck Turn Tool cutter head assembly. Built from precision-ground tool steel with a polished silver finish, this unpowered benchtop accessory threads directly into the tool housing to support and guide cartridge brass during neck skimming. By establishing a true centreline inside the case neck while the external cutter planes the brass, it ensures uniform neck wall thickness across standard .30-calibre cartridge cases, eliminating bullet runout and enhancing neck tension consistency for tight-chambered rifles.

Key Features

• Internal Case Alignment: Screws into the Hornady Neck Turn Tool cutter head to act as a rigid internal guide pilot during manual or drill-assisted case turning.
• Precision Ground Steel: Machined from solid tool steel to a dedicated diameter range of 0.3055" to 0.306" to support standard .30-calibre internal neck dimensions.
• Concentric Wall Uniformity: Asserts consistent case neck wall dimensions to eliminate bullet runout across match-grade handloads.
• Physical Cut Stop: Works alongside the cutter head assembly to establish a precise stopping point at the neck-shoulder junction without encroaching on the cartridge shoulder.

Product Specifications

• Product Name: Hornady Neck Turning Tool Mandrel .30 Caliber
• Manufacturer Part Number (MPN): 391928
• Calibre Compatibility: Nominal .30 Calibre / .308 Calibre (e.g., .308 Winchester, .30-06 Springfield, .300 Win Mag)
• Pilot Diameter: Precision ground to approximately 0.3055" – 0.306"
• Material & Finish: Precision-ground tool steel, polished silver finish
• Weight: Approximately 0.05 lbs (23 g)
• Tool Interface: Exclusively engineered for the Hornady Neck Turn Tool assembly

Who is the Hornady .30 Calibre Neck Turning Tool Mandrel for?

• Precision benchrest shooters — Requires a neck turning tool mandrel ground to a precise 0.3055" – 0.306" diameter to uniform brass neck walls for custom, tight-chambered .30-calibre match rifles.
• Long-range competitors — Benefits from standardising neck tension across .308 Winchester and .300 Win Mag brass via a dedicated 0.3055" – 0.306" diameter pilot to eliminate bullet runout at extended distances.
• Custom handloaders — Uses the calibrated 0.3055" – 0.306" tool steel mandrel inside the cutter assembly to achieve repeatable, physical cut stops at the neck-shoulder junction.

Less suitable for: Cartridge brass outside the standard .30-cal (0.308") internal neck diameter—such as 6.5mm, 7mm, or .338-calibre cases—which require calibre-specific neck turning mandrels matched to those respective bore diameters.