What calibre cartridge cases is the Hornady 391913 mandrel specifically designed for?

The Hornady 391913 mandrel is engineered specifically for 6mm / .243 calibre cartridge cases, such as the .243 Winchester, 6mm Creedmoor, 6mm BR, 6mm ARC, and .240 Weatherby Magnum. It is sized nominally at 0.240" / 0.2395" to ensure a smooth slip-fit inside the case neck without binding.

Can I use this 6mm mandrel with .224 or 6.5mm cartridge brass?

No, this mandrel is strictly built for 6mm (.243") internal neck sizing. Using it with smaller .224" calibres will prevent the case from fitting over the shaft, while larger .264" (6.5mm) or .308" cases will have excessive clearance, resulting in uneven cuts and poor concentricity.

Which neck turning tool frame is compatible with the Hornady 391913 mandrel?

This mandrel is designed to fit directly into the Hornady Neck Turn Tool frame as an internal alignment arbor. It supports the interior wall of the cartridge neck while establishing concentric alignment against the external cutting tool bit.

Are there any electrical compliance requirements or Australian certifications needed for this tool?

No electrical compliance or SAA/RCM certifications are required for this product. The Hornady 391913 is an unpowered, solid-steel mechanical hand tool accessory used entirely manually on your reloading bench.

Do I need to prep or lubricate my brass before placing it onto the mandrel?

Yes, internal case necks must be pre-expanded or full-length sized and lightly lubricated prior to sliding onto the mandrel. This preparation prevents galling, brass seizure, and ensures a smooth turning action during your precision reloading session.

6mm Neck Turning Mandrel - Hornady 391913

The Hornady Neck Turning Tool Mandrel (MPN: 391913) is a precision-machined steel alignment arbor designed for use with the Hornady Neck Turn Tool frame. Engineered specifically for 6mm / .243 calibre cartridge cases, it inserts directly into the case neck to support the interior brass wall during the turning operation. By establishing rigid, concentric alignment against an external cutter bit, this mandrel enables handloaders to shave off high spots, remove neck wall thickness variations, and clear brass "donuts" at the neck-shoulder junction for uniform neck tension and minimal bullet runout.

Key Features

Internal Neck Support: Serves as the internal guide arbor for the Hornady Neck Turn Tool, providing rigid backing to keep brass perfectly aligned with the cutting blade.
Precision Slip-Fit Sizing: Features a nominal mandrel diameter of 0.240" / 0.2395", setting it 0.0035" to 0.0040" under the nominal 0.243" bullet diameter to ensure smooth brass feeding without binding or galling.
Durable Construction: Precision machined from solid steel to resist wear and maintain concentricity over high-volume brass preparation sessions.
Passive Mechanical Operation: Completely manual tool accessory requiring no electrical power, batteries, or mains connections.

Specifications

Manufacturer Part Number (MPN): 391913
Calibre Compatibility: 6mm / .243 calibre (including .243 Winchester, 6mm Creedmoor, 6mm BR, 6mm ARC, and .240 Weatherby Magnum)
Nominal Mandrel Diameter: 0.240" / 0.2395"
Material: Precision-machined steel
Tool Compatibility: Hornady Neck Turn Tool frame

Who is the Hornady 391913 Neck Turning Tool Mandrel for?

Competitive benchrest shooters — relies on a precise 0.240" / 0.2395" nominal diameter to support 6mm brass necks, allowing this neck turning tool mandrel to eliminate wall thickness runout for maximum precision on the target line.
Long-range precision reloaders — utilizes the 6mm / .243 calibre compatibility to uniform case necks on cartridges like 6mm Creedmoor or 6mm BR, ensuring consistent bullet release and neck tension across brass batches.
Wildcat cartridge formers — provides internal support sized 0.0035" to 0.0040" below the nominal 0.243" bullet diameter, enabling handloaders to turn down brass necks and remove junction donuts when forming custom 6mm cases from parent brass.

Less suitable for: Reloaders turning case necks for .22 cal (.224"), 6.5mm (.264"), 7mm (.284"), or .30 cal (.308") cartridges, which require calibre-specific neck turning mandrels matched to those larger or smaller internal neck dimensions.

SKU	HN102573LP
Model #	391913
Brand	Hornady
Shipping Weight	0.0200kg

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Hornady 391913 Neck Turning Tool Mandrel 6mm 243 Calibre Steel

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