Hornady 380728 Cartridge Gauge 338Arc .338

The Hornady 380728 Cartridge Gauge in .338 ARC is a precision headspace and chamber-fit tool designed for reloaders and shooters who demand reliability on the range or in the field. If you're loading for .338 ARC, this gauge lets you verify that your finished cartridges will chamber safely and smoothly in SAAMI-spec firearms—critical for handloaders who need confidence in every round.

Built into Hornady's Lock-N-Load system, this cartridge gauge works as a go/no-go reference tool, helping you catch dimensional issues before they become safety problems or feeding malfunctions. Whether you're fine-tuning loads for precision rifle work or simply ensuring consistency across a batch of reloads, this .338 ARC gauge gives you a simple, repeatable way to verify case dimensions and overall cartridge geometry against established SAAMI specifications.

Reloaders appreciate cartridge gauges because they bridge the gap between component measurements and real-world function—a round might have all the right specs on paper, but a quick chamber-check with a dedicated gauge confirms it will actually feed and fire in your gun. For anyone serious about .338 ARC handloading, especially if you're working with multiple firearms or pushing tolerances, this is practical insurance against wasted components and frustration at the bench.

Key Features

• Caliber-specific design for .338 ARC ammunition verification
• Compatible with Hornady Lock-N-Load reloading system
• Checks case and cartridge fit against SAAMI chamber specifications
• Helps identify dimensional inconsistencies before firing
• Simple, intuitive go/no-go operation

Specifications

Brand	Hornady
Model Number	380728
Caliber	.338 ARC
Product Type	Cartridge Gauge / Headspace Tool
System	Lock-N-Load Compatible

Frequently Asked Questions

What is a cartridge gauge and why do I need one?

A cartridge gauge verifies that your finished handloads meet SAAMI specifications for chamber fit and overall cartridge dimensions. It's a simple go/no-go check that helps ensure your rounds will feed reliably and safely in your firearm before you take them to the range.

Is this gauge compatible with the Hornady Lock-N-Load system?

Yes, the Hornady 380728 is designed to work with the Lock-N-Load reloading platform, making it easy to integrate into your existing bench setup.

What caliber is this gauge for?

This is a .338 ARC–specific gauge. It is not compatible with other calibers; you'll need a dedicated gauge for each cartridge you reload.

Can I use this to check factory ammunition?

Yes. This gauge can verify that both handloaded and factory .338 ARC cartridges meet SAAMI specifications for your firearm.