Can I fire the Hornady A222M Modified Case in my rifle loaded with powder and a primer?

No, this is strictly a measuring tool and must never be loaded with powder or primers or fired in a rifle. It features a modified neck and a threaded head designed only for use as an inactive gauge component during the reloading process.

What level of measurement accuracy can I expect when using the Hornady A222M for .222 Remington Magnum?

When paired with a Hornady Lock-N-Load O.A.L. Gauge and a digital vernier caliper, this tool facilitates measurements accurate to within .001 inches. The case neck is precisely modified to be .002 inches oversized, allowing the bullet to slip in smoothly for repeatable cartridge overall length and base-to-ogive readings.

Will the Hornady A222M work with custom or tight-neck .222 Remington Magnum rifle chambers?

This standard SAAMI-spec modified case is not suitable for custom, tight-neck, or non-standard chambers where a factory SAAMI case does not seat fully. For custom chambers, Hornady recommends using their Custom Modified Case Service instead of this A-Series model.

What equipment do I need to pair with the Hornady A222M Modified Case to take measurements?

You will need a Hornady Lock-N-Load O.A.L. Gauge, which is available in both the Straight model C1000 and the Curved model C1550 depending on your rifle action type. Additionally, you will require a standard dial or digital vernier caliper to measure from the base of the modified case to the ogive of the seated bullet.

Are there any electrical compliance or SAA/RCM certifications required for the Hornady A222M in Australia?

No electrical compliance, SAA safety approvals, or RCM certification markings are required for this product. It is a completely non-powered, mechanical reloading accessory that is freely imported and sold across Australia as non-regulated tooling.

Modified Case - Hornady A222M

The Hornady Lock-N-Load Modified Case for .222 Remington Magnum (MPN: A222M) is a specialised measuring tool manufactured from factory brass to SAAMI specifications. It features a machined and internally threaded flash hole that attaches directly to Hornady Lock-N-Load O.A.L. Gauges (Straight model #C1000 and Curved model #C1550). Designed exclusively for precision metallic cartridge handloading, this modified case allows reloaders to determine the exact distance from the firearm chamber's bolt face to the rifling lands. This enables the precise measurement of true Overall Length (OAL) and Cartridge Base to Ogive (CBTO) accurate to within .001″ for fine-tuning bullet seating depth and bullet jump.

Key Features

Precision Threaded Base: Internally threaded at the primer pocket to screw securely onto the pushrod housing of compatible Hornady Lock-N-Load O.A.L. Gauges.
Oversized Neck Modification: Sized .002″ over standard factory neck specifications to allow standard-diameter .224″ bullets to slide freely without seating tension during chamber testing.
Direct Action Compatibility: Compatible with bolt-action and single-shot rifles when paired with a straight gauge, or lever-action and semi-automatic rifles using a curved gauge.
High Measurement Accuracy: Facilitates bullet jump and throat engagement measurements accurate to .001″ (0.0254 mm) when measured with dial or digital vernier calipers.

Product Specifications

Manufacturer Part Number (MPN): A222M
Calibre/Chamber Compatibility: .222 Remington Magnum (A-Series)
Material: Factory brass manufactured to SAAMI external dimensions
Neck Diameter Modification: .002″ oversized from factory specification
Measurement Tolerance: Accurate to within .001″ (0.0254 mm)
Tool Interface: Hornady Lock-N-Load O.A.L. Gauges (Straight #C1000 and Curved #C1550)
Unit Weight: Approximately 5–10 g
Power Requirements: None (manual, mechanical tool)

Who is the Hornady Lock-N-Load Modified Case for .222 Remington Magnum for?

Precision handloaders — who require exact bullet seating depth calculations in standard SAAMI .222 Remington Magnum chambers to within .001″ using this modified cartridge case.
Competitive shooters — who need to eliminate neck tension using a .002″ oversized neck diameter to measure free travel and bullet jump to the rifling lands for match-grade .222 Remington Magnum loads.

Less suitable for: Firearm chambers with custom, non-standard, or tight-neck dimensions where a standard SAAMI-spec case will not seat fully; reloaders facing these dimensions require a custom modified case made from rifle-fired brass submitted directly to a specialised chamber-modification service. This measuring case must never be loaded with powder or primers, nor fired in any firearm.

SKU	HN102481LP
Model #	A222M
Brand	Hornady
Shipping Weight	0.0100kg

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Hornady A222m Modified Case 222 Remington Magnum Reloading Tool

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