What size mandrel does the Redding 06123 pilot stop fit, and will it work with standard 3/16 inch mandrels?

The Redding 06123 pilot stop is designed specifically for 9/64 inch (approx. 3.57 mm) small-diameter mandrels. It will not fit standard 3/16 inch (4.76 mm) mandrels, which require the Redding Part #06124 instead.

Which specific 6mm cartridge types can I inspect using this pilot stop?

This model is restricted strictly to 6mm and .243 caliber inside neck dimensions. It is ideal for Australian benchrest and long-range precision shooters prepping popular brass variants such as 6mm BR, 6mm Dasher, 6mm Creedmoor, 6mm PPC, and .243 Winchester.

Are there any electrical compliance requirements or special safety certifications needed for this tool in Australia?

No. The Redding 06123 is a purely mechanical, unpowered workshop reloading accessory made from CNC-machined stainless steel. Therefore, 240V mains power compatibility, Australian power plugs, and SAA or RCM regulatory marks are not applicable.

How does the undercut geometry of the pilot stop help during case neck wall thickness inspection?

The pilot stop is engineered with a slight undercut profile designed to prevent the gauge from catching on burrs, dents, or imperfections at the case mouth and the neck/shoulder junction. This ensures smooth, steady dial-indicator tracking and repeatable measurements without artificial runout spikes.

Case Neck Gauge Pilot Stop - Redding 06123

The Redding 06123 Case Neck Gauge Pilot Stop is a precision-machined reloading accessory designed to pilot and align 6mm / .243 calibre cartridge cases during case neck inspection. Engineered for use with a Redding Case Neck Gauge or small-mandrel Flash Hole Deburring Tool, this component centres the cartridge on a 9/64" (approx. 3.57 mm) mandrel. It enables accurate measurement of neck wall thickness, neck uniformity, and runout on small flash hole brass without interference from neck-to-shoulder transitions or mouth burrs.

Key Features

Precision Case Alignment: Guides and centres 6mm / .243 calibre case necks directly over a small-diameter mandrel for precise dial-indicator neck wall sorting.
9/64" Mandrel Sizing: Engineered specifically with an internal bore tailored to 9/64" (approx. 3.57 mm) mandrels, supporting small flash hole (0.060" / 1.52 mm) cases like 6mm BR and 6mm PPC.
Undercut Relief Profile: Features a specialised undercut profile that prevents the pilot stop from binding on mouth burrs or the inside neck/shoulder junction, eliminating artificial runout spikes.
CNC-Machined Stainless Steel: Constructed from stainless steel for wear resistance and dimensional stability under repetitive bench brass preparation.
Dual Tool Compatibility: Integrates directly with the Redding Case Neck Gauge and Redding Small-Mandrel Flash Hole Deburring Tools.

Specifications

Manufacturer Part Number (MPN): 06123
Material: CNC-machined stainless steel
Calibre Compatibility: 6mm / .243 Calibre
Mandrel Bore Diameter: 9/64" (approx. 3.57 mm)
Flash Hole Compatibility: Small flash holes (0.060" / 1.52 mm)
Power Requirements: None (manual reloading accessory)

Who is the Redding 06123 Pilot Stop for?

Australian Benchrest Shooters — Needs a dedicated reloading case neck gauge pilot stop with a 9/64" (approx. 3.57 mm) bore to pilot small flash hole 6mm cartridges like 6mm BR and 6mm PPC during precision neck wall sorting.
Long-Range Precision Shooters — Requires this 6mm / .243 calibre pilot stop to prevent dial indicator runout errors when measuring 6mm Creedmoor and 6mm Dasher brass on a small-diameter 9/64" (3.57 mm) mandrel.

Less suitable for: Reloaders inspecting cases on standard 3/16" (4.76 mm) mandrels or sorting different bore sizes such as .22 calibre or 6.5mm; these setups require a dedicated 3/16" mandrel pilot stop (such as Redding Part #06124) or calibre-specific pilot stop bushings.

SKU	RD102863LP
Model #	06123
Brand	Redding
Shipping Weight	0.1000kg

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Redding 06123 Case Neck Gauge Pilot Stop 6mm .243 Caliber

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