The RCBS Bullet Mould 310-120-RN (Model: R82023) is a heavy-duty, double-cavity casting mould designed to produce lead-alloy bullets for reloading classic .310 Cadet (Martini Cadet) cartridges. Machined from solid, precision-ground pearlitic malleable cast iron blocks, this manual hand tool ensures thermal stability and structural integrity during the casting process. The blocks feature hardened steel alignment pins to guarantee precise mating of the halves, which prevents flashing and out-of-round bullets. To resist corrosion and assist in smooth bullet release, the block halves are heat-blued. This mould is purely mechanical and requires no electrical power, making it fully independent of Australian electrical compliance or safety certifications.

Key Features

• Cast Iron Construction: Built from solid pearlitic, malleable cast iron blocks that maintain thermal stability when pre-heated to casting temperatures between 340°C and 400°C.
• Double-Cavity Capacity: Designed with two cavities to cast two lead-alloy bullets simultaneously, balancing precision with manual production efficiency.
• Heavy-Duty Sprue Plate: Equipped with a 3/16-inch-thick solid steel sprue plate secured by tempered steel spring washers and screws for clean cuts.
• Heeled Bullet Profile: Cut using high-grade tool steel to produce the traditional 120-grain, round-nose heeled bullet shape specific to historic firearms.
• Corrosion Resistance: The iron blocks are heat-blued to resist moisture damage and ensure clean, easy bullet release.

Product Specifications

• Model/SKU: R82023 (82023)
• Calibre/Diameter: .310 calibre (.310" diameter)
• Bullet Weight: 120 Grains
• Bullet Profile: Round Nose (RN) (heeled bullet design)
• Approximate Bullet Length: 0.68 inches
• Cavity Count: Double Cavity (2-Cavity)
• Mould Block Weight: 1.0 lb (approx. 0.45 kg)
• Packaged Dimensions: 3.6" L x 2.1" W x 2.1" H
• Required Accessories: RCBS 2-Cavity Mould Handles (Item #80025) and RCBS #543 Top Punch for sizing (both sold separately)

Who is the Rcbs Bullet Mould 310-120-Rn for?

• Vintage and military surplus rifle shooters — who participate in historic target matches and require highly precise, custom-cast 120-grain lead-alloy bullets featuring a .310-inch diameter heeled round nose profile to shoot accurately in vintage rifles.
• Australian small-game hunters — reloading for historic Martini Cadet rifles, who need a dedicated double-cavity bullet mould to produce traditional 120-grain heeled projectiles to keep these classic 20th-century firearms active in the field.

Less suitable for: Shooters requiring a modern gas-check design or standard .30-calibre non-heeled rifle bullets (such as for a .308 Winchester or .30-30), who should transition to alternative rifle mould models like the RCBS 30-180-FN or 30-180-SP; or high-volume reloaders seeking to cast hundreds of bullets per hour, who are better suited using multi-cavity gang moulds with 4-cavity or 6-cavity capacities.