HORNADY C30378 30-378 WBY LOCK-N-LOAD MODIFIED CASE

The Hornady Lock-N-Load Modified Case 30-378 Weatherby Magnum (C30378) is a brass tool case for reloaders who use Hornady Lock-N-Load Precision and O.A.L. Gauges to set exact bullet seating depth in 30-378 Wby Mag rifles. This C30378 modified case for 30-378 Weatherby works with those gauges so you can match cartridge overall length to your specific chamber instead of relying only on manual data.

Key Features

• Manufacturer part number: C30378
• Cartridge: 30-378 Weatherby Magnum
• Case family: Hornady Lock-N-Load Modified Case C Series
• Intended use: for use with Hornady Lock-N-Load Precision and O.A.L. Gauges
• Material: brass modified case
• Case body: manufactured to 30-378 Weatherby Magnum chamber dimensions within SAAMI specifications
• Neck: neck made approximately 0.002 inch oversize to accept the same bullets you intend to load
• Case head: special fine thread at the head to attach directly to Lock-N-Load gauges and keep the case square in the chamber
• Quantity: one modified case per package

Special Features

• The C30378 modified case uses a fine threaded case head so it screws securely into Hornady Precision and O.A.L. Gauges and stays aligned while you move the bullet up to the lands.
• The slightly oversize neck lets a 30-caliber bullet slip into the case mouth easily while maintaining light grip for smooth, repeatable movement during length checks.
• Hornady builds the C30378 to chamber-realistic dimensions for 30-378 Weatherby Magnum, giving you a more accurate seating depth reference than simulated test bodies.
• Interchangeable C Series modified cases like the C30378 let you run one Hornady gauge body across multiple large magnum calibers by swapping cases.

Practical Benefits

• The Hornady Lock-N-Load Modified Case 30-378 Weatherby Magnum (C30378) gives you a repeatable way to find the cartridge length that fits your rifle’s freebore so you tune seating depth for accuracy instead of guessing from book lengths.
• Because the C30378 case works with compatible straight and curved Hornady gauges, it fits many 30-378 Wby Mag long-range and hunting rifles that accept the tool and lets you standardize your seating depth process across more than one gun.
• The brass construction and oversize neck let you test with the same bullets you plan to load, so the distance to the lands you measure transfers cleanly to your seating die setup.
• If you load 30-378 Weatherby Magnum for long-range or big game rifles, the Hornady Lock-N-Load Modified Case 30-378 Weatherby Magnum (C30378) is a practical choice that helps your handloads match your chamber and perform the way you built them.