The Lyman Mould Single Cavity 45 Cal Postell (SKU: LY-M40132, MPN: 2640132) is a precision-engineered bullet casting mould designed for serious handloaders who demand extreme accuracy. Machined from solid leaded-steel blocks and heat-treated to a durable blue finish, this mould is built to withstand years of heavy use. It casts a heavy 535-grain, semi-pointed round nose projectile based on the legendary Postell design (Bullet Design #457132). This specific design is highly regarded globally for its exceptional ballistic coefficient and stability over long distances. The mould produces bullets with a nominal cast diameter of .458" to .459", depending on the lead alloy used, making it an excellent choice for traditional large-bore rifles.

Key Features:

• Precision Machined Steel Blocks: Crafted from solid leaded-steel and heat-treated for long-term structural integrity and consistent casting cycles.
• Hardened Alignment Pins: Features heavy-duty steel alignment pins to ensure the two block halves mate perfectly every time, preventing parting-line flash.
• Flat Ground Sprue Plate: The solid steel sprue plate is ground flat and held firmly against the blocks with tempered steel spring washers, ensuring clean, flat-based bullets.
• The Postell Profile: Casts the classic #457132 semi-pointed 535-grain bullet, renowned for its superior wind-drifting resistance in long-range target disciplines.
• Mechanical Design: This is a traditional, non-electrical workshop tool. It requires no electrical power, heating elements, or Australian AS/NZS 3112 plug configurations, making it safe and simple to use in any standard casting setup.

Product Specifications:

• Brand: Lyman
• Model Number: LY-M40132
• Bullet Design: #457132 Postell
• Caliber: .45 Caliber
• Nominal Cast Diameter: .458" to .459"
• Nominal Bullet Weight: 535 grains
• Bullet Profile: Semi-Pointed / Round Nose (RN)
• Cavity Count: Single Cavity (1-Cavity)
• Material: Heat-treated leaded-steel
• Compatibility: Requires Lyman double-cavity mould handles (sold separately) and is compatible with Lyman Top Punch #132 (sold separately) for sizing.

Who It Is For:

This single-cavity mould is specifically tailored for Australian competitive shooters, vintage rifle enthusiasts, and precision handloaders. It is highly sought after by those participating in Black Powder Cartridge Silhouette (BPCS) and long-range target shooting disciplines using classic rifles, particularly those chambered in .45-70 Government. Because casting a heavy 535-grain projectile requires a significant volume of molten metal, this mould is best suited for experienced casters who utilise a hand-held lead ladle or dipper to ensure complete, sharp cavity fill and maximum weight consistency across every cast.