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The Hornady Lock-N-Load Cartridge Gauge for 300 Blackout is designed to check case and ammunition fit to SAAMI chamber dimensions. Made from steel, it offers reloaders a way to ensure cases and loaded cartridges meet standard specifications during the reloading process.
This gauge is useful for maintaining consistency and function in reloaded ammunition for the 300 AAC Blackout caliber. It provides a reliable check that cases and rounds conform to industry-standard chamber sizes.