HORNADY A450B 450 BUSHMASTER LOCK-N-LOAD MODIFIED CASE

The Hornady Lock-N-Load Modified Case 450 Bushmaster (A450B) 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 450 Bushmaster rifles. This A450B modified case for 450 Bushmaster lets you match cartridge overall length to your rifle’s chamber instead of relying only on manual data.

Key Features

• Manufacturer part number: A450B
• Cartridge: 450 Bushmaster
• Case family: Hornady Lock-N-Load Modified Case A Series
• Intended use: for use with Hornady Lock-N-Load O.A.L. and Precision Gauges
• Material: brass modified case
• Case body: manufactured to 450 Bushmaster 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
• Flash hole: drilled and threaded to allow the O.A.L. gauge rod to push the bullet through the case
• Quantity: one modified case per package

Special Features

• The A450B modified case uses a fine threaded case head so it screws securely into Hornady gauges and stays aligned while you move the bullet up to the lands.
• The slightly opened oversize neck lets a .452‑diameter 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 A Series modified cases like the A450B let you run one Hornady gauge body across many calibers by swapping cases.

Practical Benefits

• The Hornady Lock-N-Load Modified Case 450 Bushmaster (A450B) 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 A450B case works with compatible straight and curved Hornady gauges, it fits many 450 Bushmaster AR-pattern and bolt-action 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.