The Hornady Cartridge Gauge in .357 inch for .357 Magnum (Hornady part no. 380703) lets reloaders verify cases and finished ammunition fit SAAMI chamber specifications before a round is fired. As part of Hornady’s Lock-N-Load line of cartridge gauges, it gives revolver and lever-gun shooters a quick pass/fail check that catches an oversized case or a bullet seated too long before it becomes a jam or hard chambering at the range. Reloaders running high round counts through .357 Magnum handguns and carbines rely on gauges like this one as a final step before a batch goes in the ammo can.

Key Specifications

• Gauges cases and ammunition to .357 Magnum chamber dimensions.
• Checks fit against SAAMI chamber specifications.
• Part of Hornady’s Lock-N-Load cartridge gauge lineup.
• Ships at approximately 0.33 lb.
• A round that seats flush in the gauge falls within SAAMI chamber tolerances; one that does not should be set aside before firing.

Frequently Asked Questions

What is this specific gauge sized for? .357 Magnum.

Can this gauge be used on both revolver and lever-action loads? Yes, it checks SAAMI chamber fit for .357 Magnum ammunition regardless of the firearm it will be fired in.

Buy the Hornady Cartridge Gauge .357in, .357 Magnum

Confirm every .357 Magnum round or case fits SAAMI spec before your next range trip. Order from Hornady through our reloading equipment lineup, with fast shipping from our Lubbock, Texas gun shop.