Lyman Multi-Caliber Small Rifle Ammo Checker Cartridge Gauge for 204 Ruger, 22 Hornet, 223 Remington, 22-250 Remington, 300 AAC Blackout, 7.62x39mm

The Lyman Multi-Caliber Small Rifle Ammo Checker is a go/no-go cartridge gauge built to verify that your reloaded or factory ammunition will chamber safely in your rifle. Whether you're working up loads for 223 Remington, 22-250, 300 AAC Blackout, 204 Ruger, 22 Hornet, or 7.62x39mm, this single gauge covers six common small rifle calibers—eliminating the need to buy separate tools for each round. Drop a loaded cartridge into the appropriate slot, and if it seats without binding, you know it'll feed reliably in your gun. That simple test catches sizing and seating errors before they become misfires or worse.

Built from solid 6061 T6 aircraft-grade aluminum and machined to SAAMI minimum chamber dimensions, the Lyman gauge gives you a fast, repeatable quality check right on your reloading bench. The bright orange anodizing keeps it visible and easy to grab, and each caliber marking is clearly engraved so there's no confusion when you're working multiple cartridges. For handloaders serious about consistency—and anyone who values reliable feeding—this is the kind of tool that pays for itself the first time it catches an out-of-spec round.

If you reload or shoot a lot of small rifle ammunition, a no-go gauge belongs in your kit. The Lyman Ammo Checker does exactly one job and does it well: it takes the guesswork out of whether your ammunition will actually work.

Key Features

• Multi-caliber design covers 204 Ruger, 22 Hornet, 223 Remington, 22-250 Remington, 300 AAC Blackout, and 7.62x39mm
• Machined from 6061 T6 aircraft-grade aluminum for durability and precision
• Dimensioned to SAAMI minimum specifications for accurate go/no-go testing
• Bright orange anodized finish for easy visibility on the bench
• Caliber markings clearly engraved on each gauge
• Quick, reliable way to verify ammunition will fit and feed safely

Specifications

Frequently Asked Questions

What calibers does this ammo checker work with?

This Lyman gauge is designed for small rifle cartridges: 204 Ruger, 22 Hornet, 223 Remington, 22-250 Remington, 300 AAC Blackout, and 7.62x39mm. One gauge covers all six, so you don't need to buy separate tools for each caliber.

How do I use the Lyman Ammo Checker?

Simply drop a loaded round into the slot corresponding to your caliber. If the cartridge fits and seats without binding, it will fit in your gun's chamber. If it sticks or doesn't seat, your ammunition is out of spec and should not be fired.

Will this gauge work with both reloads and factory ammo?

Yes. The Lyman Ammo Checker works with any ammunition—reloads or factory rounds—to verify chamber fit and consistency.

What is the gauge machined to?

The gauge is machined from solid 6061 T6 aircraft-grade aluminum and cut to SAAMI minimum chamber dimensions for accurate, reliable go/no-go testing.