What specific cartridge brass and bullet diameters is the Hornady 391910 mandrel compatible with?

This mandrel features an internal diameter of 0.2210 inches and is engineered specifically for .22 calibre, .224-inch bullet-diameter centre-fire rifle brass. Common compatible cartridges include .223 Remington, .22-250 Remington, .220 Swift, and .224 Valkyrie. It is strictly incompatible with sub-calibres like .17 or .204, as well as larger calibres such as 6mm or .30 cal.

Which specific neck turning tool systems can I use with this Hornady mandrel?

The Hornady 391910 mandrel is exclusively designed to screw directly into the Hornady Lock-N-Load Case Neck Turning Tool assembly (Item #041224). It is not cross-compatible with third-party neck-turning platforms from brands like K&M, PMA, Sinclair, or Forster unless using custom proprietary adapters.

How do I properly set up and operate this mandrel to avoid binding or brass damage during turning?

Before turning, ensure your .224 brass cases have been resized and neck-expanded using an expander mandrel roughly 0.001 inches larger than the turning mandrel, and apply a light coat of case lube. If you are operating the tool via a powered drill attachment, maintain a low RPM to prevent frictional heat build-up. Excessive speed causes the stainless steel mandrel to expand, which can result in brass binding and inconsistent turning dimensions.

Are there any Australian electrical compliance or regulatory requirements for purchasing and using this tool?

No electrical compliance certifications such as SAA or RCM apply to this product. The Hornady neck turning mandrel is a fully passive, non-powered mechanical reloading tool and is completely unrestricted for retail sale and use across all Australian states and territories.

How should I maintain and store this stainless steel mandrel to ensure long-term precision?

Constructed from precision-machined stainless steel with a polished silver finish, the mandrel requires minimal upkeep under standard indoor reloading bench conditions. To protect it from corrosion in humid outback or coastal Australian workshops, wipe it down with a light coat of gun oil or rust preventative after use and store it in a dry container like an MTM Case-Gard utility box alongside your other reloading gear.

Neck Turning Mandrel - Hornady 391910

The Hornady Neck Turning Tool Mandrel .22 Caliber (MPN 391910) is a precision-machined reloading accessory designed to support and guide the interior of .224-calibre centre-fire rifle brass during the neck-turning process. Operating as an internal alignment guide and depth stop, this tool allows reloaders to shave down variations in case neck wall thickness to produce consistent wall concentricity and uniform bullet release tension. Constructed from polished stainless steel to minimise friction and galling, this passive mechanical component threads directly into the Hornady Lock-N-Load Case Neck Turning Tool frame.

Key Features

Calibre-Specific Internal Sizing: Machined to an internal mandrel diameter of 0.2210 in (0.221 in) to provide a precise fit inside expanded .22 calibre brass necks.
Threaded Tool Interface: Screws directly into the Hornady Neck Turning Tool body (Item #041224) to maintain concentric alignment with the exterior turning cutter.
Polished Stainless Steel Finish: Features a smooth surface finish that prevents internal neck galling and excessive friction during manual or drill-powered turning.
Passive Operation: Functions as a fully mechanical reloading tool requiring no electrical power or external connections.

Product Specifications

Product Name: Hornady Neck Turning Tool Mandrel .22 Caliber
Model / MPN: 391910
Internal Mandrel Diameter: 0.2210 in (0.221 in)
Cartridge/Calibre Compatibility: .22 Calibre / .224 in bullet-diameter centre-fire rifle brass (including .223 Remington, .22-250 Remington, .220 Swift, and .224 Valkyrie)
Tool System Compatibility: Hornady Lock-N-Load / Case Neck Turning Tool (Item #041224)
Material: Polished stainless steel
Packaged Weight: Approximately 0.05 lb (~23 g)

Who is the Hornady Neck Turning Tool Mandrel .22 Caliber for?

Precision .22-Calibre Rifle Reloaders — who require a turning mandrel with a precise 0.2210 in diameter to properly support .224-calibre centre-fire cartridge necks, such as .223 Remington, .22-250 Remington, .220 Swift, or .224 Valkyrie, during brass wall thickness trimming.
Competitive Benchrest and Long-Range Shooters — who rely on this reloading neck turning mandrel to eliminate neck wall variations down to uniform tolerances on .224-calibre brass, ensuring predictable bullet release tension and improved shot-to-shot concentricity.

Less suitable for: Reloaders turning sub-calibre brass (such as .17 or .204) or larger cartridges (such as 6mm, 6.5mm, or .30 calibre), who require calibre-specific mandrels matched to their bullet diameter, as well as users of non-Hornady neck-turning tool platforms that require brand-specific proprietary mandrels.

SKU	HN102567LP
Model #	391910
Brand	Hornady
Shipping Weight	0.0200kg

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Hornady 391910 Neck Turning Tool Mandrel 22 Caliber Reloading

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