HORNADY B300W 300 WSM LOCK-N-LOAD MODIFIED CASE OAL

The Hornady Lock-N-Load Modified Case 300 WSM (B300W) is a brass tool case for reloaders who use Hornady Lock-N-Load O.A.L. and Precision Gauges to set exact bullet seating depth in 300 Winchester Short Magnum rifles. This B300W modified case for 300 WSM lets you match cartridge overall length to your rifle’s chamber instead of relying only on manual data.

Key Features

• Manufacturer part number: B300W
• Cartridge: 300 Winchester Short Magnum
• Case family: Hornady Lock-N-Load Modified Case B Series
• Intended use: for use with Hornady Lock-N-Load O.A.L. and Precision Gauges
• Material: brass modified case
• Case body: manufactured to 300 WSM chamber dimensions within SAAMI specs
• Neck: neck made approximately 0.002 inch oversize to accept the same bullets you intend to load
• Case head: fine threaded case 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 B300W 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 opened, oversize neck lets a 30-caliber bullet slip into the case mouth easily while remaining concentric for smooth, repeatable overall length checks.
• Chamber-realistic construction gives you a more accurate seating depth reference than generic test bodies or improvised cases.
• Interchangeable B Series modified cases like the B300W let you run one Hornady gauge body across multiple short magnum calibers by swapping cases.

Practical Benefits

• The Hornady Lock-N-Load Modified Case 300 WSM (B300W) 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 B300W case works with compatible straight and curved Hornady gauges, it fits many 300 WSM hunting and long-range 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.