What specific tool is required to use the Hornady B338 Modified Case?

This case is designed to work seamlessly with Hornady's Lock-N-Load O.A.L. Gauge tool series, utilizing a special fine thread at the head to attach securely to either the Straight (C1000) or Curved (C1550) gauge bodies.

Can I use this modified case for .338 Lapua Magnum or .338 RCM cartridges?

No, the B338 model is strictly engineered to SAAMI dimensions for the .338 Remington Ultra Magnum chamber. It is not compatible with .338 Lapua Mag, .338 RCM, or .338 ARC chambers, which require their own specific modified case models.

How does the neck design allow for accurate bullet seating depth measurements?

The case neck is perfectly round and factory-expanded by exactly 0.002 inches over standard bullet diameter. This allows a standard .338-calibre projectile to slide smoothly and concentrically through the mouth when pushed by the gauge rod to engage the rifling lands.

Do I need a firearms licence or electrical compliance certifications to purchase this in Australia?

No firearms licence or permit is generally required to purchase this unprimed, inert reloading tool component in Australian states and territories. Furthermore, because it is a non-powered, mechanical workshop tool, 240V compatibility and SAA/RCM electrical certifications are not applicable.

Modified Case - Hornady B338

The Hornady Lock-N-Load® Modified Case – .338 Remington Ultra Magnum (B338) is a dedicated reloading tool designed to measure precise bullet seating depth and distance to the rifling lands. Manufactured to factory SAAMI dimensions for .338 Remington Ultra Mag brass, this unprimed case threads directly onto a Hornady Lock-N-Load Straight (C1000) or Curved (C1550) Overall Length (O.A.L.) Gauge. It enables handloaders to determine bullet jump with measurement precision down to 0.001 inches using their actual projectiles.

Key Features

Oversized Case Neck: Factory neck is expanded by .002" over standard bullet diameter, allowing standard .338-calibre projectiles to slide smoothly and concentrically through the case mouth.
Threaded Case Head: Drilled and tapped with fine threads that mate square to the Hornady Lock-N-Load O.A.L. Gauge tool body.
SAAMI-Spec Dimensions: Sized to standard factory dimensions to reliably chamber in factory-spec .338 Remington Ultra Mag rifles.
Action Versatility: Pairs with straight gauge bodies for bolt-action and single-shot rifles, or curved gauge bodies for breech access in lever-action, pump-action, and semi-automatic firearms.

Specifications

Brand: Hornady
Model Number: B338
Calibre / Chambering: .338 Remington Ultra Magnum (.338 RUM)
Category: Reloading case length gauge / modified case
Neck Expansion: .002" over standard projectile diameter
Tool Interface: Hornady Lock-N-Load Straight (C1000) and Curved (C1550) O.A.L. Gauges
Approximate Weight: 15–25 g
Measurement Accuracy: Down to 0.001 inches (when paired with O.A.L. gauge and callipers)

Who is the Hornady B338 Modified Case for?

Precision Handloaders — requires an exact chamber-to-rifling measurement for load development, using this reloading case length gauge with a neck opened by .002" to freely slide .338-calibre projectiles without binding during depth checks.
Long-Range Hunters — optimizes bullet-to-lands jump in bolt-action hunting rifles chambered specifically in .338 Remington Ultra Magnum to maximize cartridge consistency and downrange accuracy.

Less suitable for: Firearms chambered in other .338-calibre cartridges such as .338 Lapua Mag, .338 RCM, or .338 ARC, or rifles featuring tight-neck, custom wildcat, or heavily fire-formed chambers, which require a custom modified case made directly from the user's fired brass.

SKU	HN102493LP
Model #	B338
Brand	Hornady
Shipping Weight	0.1000kg

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Hornady B338 Lock-N-Load Modified Case 338 Remington Ultra Mag Reloading

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