Can I use the Hornady A6MM modified case for my .243 Winchester or 6mm Creedmoor handloads?

No, this modified case is built strictly for 6mm Remington chambers and features specific case geometry and headspace dimensions unique to that cartridge. It cannot be safely or accurately used for other 6mm calibres such as .243 Winchester, 6mm Creedmoor, or 6mm BR.

How do I attach this modified case to my reloading setup and what gauge is required?

The case head is drilled and tapped with Hornady’s proprietary fine internal thread to screw directly and squarely onto the Hornady Lock-N-Load O.A.L. Gauge Straight Model (C1000) or Curved Model (C1550). The case neck is opened up by .002 inches oversized so you can easily slip standard .243-inch bullets into the mouth without neck-tension resistance.

Will this modified case work in my custom 6mm Remington rifle with a tight-neck chamber?

It is manufactured to standard SAAMI chamber specifications and is not designed for tight-neck custom target chambers. Rifles featuring non-standard custom dimensions typically require a custom modified case made directly from the user's fire-formed brass.

Does this unpowered reloading tool require any electrical compliance certifications or special Australian permits?

As a completely passive, unpowered mechanical brass tool, it contains no electrical components, wiring, or circuitry and therefore does not require 240V or SAA/RCM electrical certification. Furthermore, as inert, unprimed modified brass tooling, it is generally treated as non-regulated reloading equipment across Australian states and territories.

6mm Remington Case - Hornady A6MM

The Hornady Lock-N-Load® Modified Case – 6mm Remington (Model A6MM) is a specialised handloading tool engineered to measure the precise distance from a rifle chamber's bolt face to the rifling lands. Manufactured to factory SAAMI specifications from brass, the case head is drilled and tapped with Hornady's proprietary fine internal thread to attach squarely to Lock-N-Load® Overall Length (O.A.L.) Gauges. This enables precision handloaders to determine optimal bullet seating depth and chamber clearance for specific 6mm Remington projectiles with measurements accurate to .001″ when paired with a caliper and bullet comparator.

Key Features

.002″ Oversized Neck: The case neck is sized .002″ oversized, allowing standard .243″ (6mm) diameter bullets to slide freely and concentrically into the case mouth without neck-tension resistance.
Threaded Base Interface: Features a fine internal thread in the case head that screws directly onto Hornady O.A.L. Gauges to maintain true alignment inside the firearm chamber.
O.A.L. Gauge Compatibility: Fully compatible with both the Straight Model (Item #C1000) for bolt-action and single-shot rifles, and the Curved Model (Item #C1550) for auto-loaders, lever-action, and pump-action firearms.
SAAMI-Spec Geometry: Built to standard 6mm Remington factory case dimensions to ensure correct fitment in production chambers.

Specifications

Brand: Hornady
Model Number: A6MM
Calibre: 6mm Remington
Material: Brass (SAAMI specification)
Neck Dimension: .002″ oversized to accept standard .243″ projectiles
Weight: Approximately 10–15 g (under 0.05 kg packaged)
Power Type: Passive mechanical tool (no electrical power required)

Who is the Hornady Lock-N-Load Modified Case 6mm Remington for?

6mm Remington precision handloaders — provides the exact 6mm Remington chamber geometry and a .002″ oversized neck required to seat .243″ projectiles by hand and determine the precise rifling contact point for this specific cartridge.
Handloaders measuring bullet seating depth to .001 inch — pairs with Hornady O.A.L. Gauges and bullet comparators to deliver overall length measurements accurate to .001″ for tuning cartridge base-to-ogive clearance.

Less suitable for: Handloaders loading other 6mm-diameter cartridges such as 6mm Creedmoor, 6mm BR, or .243 Winchester due to distinct case geometry and headspace differences, which require a modified case built specifically for that cartridge, or those running tight-neck custom target chambers, which require a custom-machined modified case created directly from fire-formed brass.

SKU	HN102510LP
Model #	A6MM
Brand	Hornady
Shipping Weight	0.0100kg

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Hornady A6mm Modified Case 6mm Remington Brass Gauge Tool

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