What additional equipment do I need to use the Hornady A303 modified case?

To use the A303, you will need a Hornady Lock-N-Load O.A.L. Gauge (available in straight C1000 or curved C1550 models) along with a set of digital or dial calipers. The modified case features a threaded case-head that screws directly onto the gauge rod to measure your rifle's chamber accurately.

Can I use the A303 modified case with wildcat cartridges like the .303/25 or .303/270 commonly found in Australia?

No, the A303 is strictly built to standard SAAMI cartridge exterior dimensions for standard .303 British chambers (~2.222 in case length). It will not function correctly in wildcat variant chambers or non-standard Lee-Enfield chambers with heavily fire-formed dimensions, in which case Hornady recommends a custom threaded case conversion.

How does the oversized neck on the A303 help achieve precise bullet seating measurements?

The neck of the A303 case is specially expanded by .002 inches over standard dimensions to allow a friction-free slip fit for standard .311 to .312 inch bullets. This enables the O.A.L. gauge plunger to push the projectile smoothly into contact with your rifle's rifling lands, helping you determine precise seating depth within .001 inches.

Modified Case - Hornady A303

The Hornady Lock-N-Load Modified Case – .303 British (Manufacturer Model Number A303) is a precision reloading measurement tool engineered to determine the exact distance from a firearm's bolt face to the rifling lands. Machined to standard SAAMI exterior dimensions with a standard case length of approximately 2.222 in (56.4 mm), this unprimed brass casing features a threaded head that screws directly onto a Hornady Lock-N-Load O.A.L. Gauge (Straight Model #C1000 or Curved Model #C1550). By opening the case neck by .002 in (0.05 mm), the modified case allows standard .311–.312 in diameter projectiles to slide freely into the chamber rifling, enabling handloaders to establish custom seating depth and bullet jump with up to .001 in accuracy using standard calipers.

Key Features

Threaded Head Design: Features a tapped primer pocket that mounts directly to the push-rod shaft of Hornady Lock-N-Load O.A.L. Gauges.
Specially Expanded Neck: Machined .002 in over standard dimensions to provide a friction-free slip fit for .311–.312 in bullets.
Precision Measurement: Allows handloaders to pinpoint cartridge overall length (C.O.A.L.) and distance to the rifling lands within .001 in.
Mechanical Interface: Completely non-powered benchtop reloading accessory machined to SAAMI .303 British exterior tolerances.

Product Specifications

Model Number: A303 (SKU 200-A303)
Calibre: .303 British
Case Length: ~2.222 in (56.4 mm)
Neck Expansion: .002 in (0.05 mm) over standard
Compatible Bullet Diameters: .311 in to .312 in
Measurement Accuracy: Within .001 in
Weight: Approximately 10–15 g (packaged weight under 50 g)
Required Accessories: Hornady Lock-N-Load O.A.L. Gauge (Straight #C1000 or Curved #C1550) and dial/digital calipers

Who is the Hornady Lock-N-Load Modified Case .303 British for?

Vintage service rifle target shooters using Lee-Enfield rifles — requires a SAAMI-spec 2.222 in modified case to accurately measure chamber depth and establish precise bullet seating depth across service rifle platforms.
Handloaders tailoring custom bullet jump for .303 British chambers — benefits from the .002 in oversized neck expansion on this reloading modified case, allowing .311–.312 in projectiles to slide freely into rifling contact for seating measurements within .001 in accuracy.

SKU	HN102489LP
Model #	A303
Brand	Hornady
Shipping Weight	0.0100kg

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Hornady A303 Lock N Load Modified Case 303 British Reloading Tool

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