Hornady Lock-N-Load Modified Case B Series .300 WSM

Precision Reloading Starts with the Right Tools

The Hornady Lock-N-Load Modified Case B Series represents a thoughtful approach to precision ammunition development. These cases are purpose-built to work seamlessly with Hornady's Lock-N-Load Precision gauges, eliminating guesswork from the critical early stages of cartridge development.

Key Design Features

Fine-Thread Attachment A specially designed fine thread secures the modified case to your gauge with absolute certainty. This mechanical advantage keeps the case perfectly square during every measurement, ensuring your chamber alignment is precise and repeatable.

Perfectly Round Neck The case neck is manufactured to exacting tolerances and opened slightly to accommodate standard-diameter bullets. This design allows bullets to seat concentrically—that is, centered perfectly within the case mouth—which is fundamental to consistent accuracy.

Oversized Neck Specification Each modified case features a .002" oversized neck. This dimension is carefully calculated to accept the same bullets you'll use in your finished ammunition, allowing you to verify fit and seating depth with confidence before committing to a full loading session.

Why This Matters

Precision reloading demands attention to detail at every stage. These modified cases bridge the gap between theory and practice, giving you a tangible way to verify your setup before investing time and materials in a complete batch. Available in all common cartridge sizes, including the .300 WSM.

For the serious handloader, this is a small investment that pays dividends in consistency and confidence.