What type of bullet does the Lyman Mould 378 335gr cast, and what are its key dimensions?

This mould casts a 335-grain Round Nose (Postell) bullet with a nominal diameter of .378 inches. It is specifically designed for the .38-55 Winchester (.38-55 WCF) cartridge, producing heavy, aerodynamic bullets ideal for long-range accuracy. The precision-machined solid leaded-steel construction ensures consistent, high-quality castings.

Who is this Lyman mould best suited for, and what shooting disciplines is it used in?

The Lyman Mould 378 335gr is primarily designed for competitive shooters, particularly those involved in Black Powder Cartridge Silhouette (BPCS) competitions and long-range buffalo single-shot rifle matches. Its heavy, aerodynamic Postell profile provides excellent stability and accuracy over extended distances, making it ideal for experienced traditional rifle shooters.

What additional equipment do I need to use the Lyman Mould 378 335gr?

To use this single-cavity mould, you will require Lyman Single Cavity Mould Handles, which are sold separately. For optimal bullet sizing after casting, it is also compatible with the Lyman #663 Top Punch, which is also sold separately.

Are there any specific safety considerations or Australian compliance requirements for using this bullet mould?

As this is a purely mechanical tool for casting lead bullets, it does not contain electrical components and therefore has no 240V, SAA, or RCM compliance requirements. However, bullet casting involves melting lead, so it is crucial for Australian users to operate in highly ventilated areas and wear appropriate personal protective equipment (PPE) to prevent lead exposure and severe burns.

What is the construction of this mould, and how does it contribute to its durability and performance?

The Lyman Mould 378 335gr is precision-machined from solid leaded-steel blocks, which are heat-treated to a blue finish for exceptional durability and warp resistance. It features hardened steel alignment pins for perfect block alignment and a flat-ground steel sprue plate, ensuring clean, consistent castings and a fast break-in period compared to traditional iron moulds.

335gr Postell Bullet Mould - Lyman LY-M40674

Product Overview

The Lyman Single Cavity Bullet Mould .378" 335 Grain Round Nose (Postell), model LY-M40674 (also identified by manufacturer part number LY-2640674), is a precision-machined casting tool designed for traditional rifle shooters and handloaders. Machined from solid leaded-steel blocks, this mould is heat-treated to a distinct blue finish that enhances durability and prevents warping under high casting temperatures. It is engineered to cast a heavy 335-grain Postell-style bullet with a nominal diameter of .378", making it highly effective for classic black powder and single-shot rifle cartridges. As a purely mechanical hand tool, this mould requires no electrical power, making Australian 240V electrical compliance and RCM certifications completely non-applicable.

Key Features

Leaded-Steel Construction: Crafted from solid leaded-steel to deliver an exceptionally smooth, super-fine finish on cast bullets, facilitating easy release from the cavity.
Heat-Treated Blue Finish: The steel blocks undergo a specialised heat-treatment process that minimises the risk of warping over thousands of casting cycles, ensuring long-term dimensional stability.
Hardened Steel Alignment Pins: Features precision-ground, hardened steel alignment pins that ensure the two halves of the mould block align perfectly every time, preventing parting-line flash on the cast projectiles.
Flat-Ground Sprue Plate: The solid steel sprue plate is ground completely flat and held tightly against the block with tempered steel spring washers and screws, ensuring clean, flat bullet bases.
Fast Break-In Period: Due to the premium metallurgy and heat treatment, this mould requires roughly half the break-in time of traditional cast-iron moulds.

Technical Specifications

Model Number: LY-M40674 (MPN: LY-2640674)
Mould Number: #378674
Nominal Bullet Diameter: .378" (typically casts within the .377" to .379" range depending on the specific lead, tin, and antimony alloy mixture used)
Nominal Bullet Weight: 335 grains (varies slightly based on alloy composition)
Bullet Profile: Round Nose (RN) / Postell
Cavity Count: Single Cavity (1-Cavity)
Required Accessories: Requires Lyman Single Cavity Mould Handles (sold separately)
Sizing Compatibility: Compatible with the Lyman #663 Top Punch (sold separately) for use in bullet sizing and lubricating presses

Who It Is For

This precision mould is specifically designed for Australian competitive shooters and handloaders who load for the classic .38-55 Winchester (.38-55 WCF) cartridge. It is highly favoured by participants in Black Powder Cartridge Silhouette (BPCS) competitions and long-range single-shot rifle matches, where the heavy, aerodynamic Postell profile provides excellent stability and accuracy over extended distances. Because bullet casting involves working with molten metals, Australian users must operate this equipment in highly ventilated workshop environments and wear appropriate personal protective equipment (PPE), including heavy leather gloves and eye protection, to ensure safety during the casting process.

SKU	LY38326LP
Model #	LY-M40674
Brand	Lyman
Shipping Weight	1.0000kg

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Lyman Ly-M40674 Bullet Mould .378 335gr Round Nose Postell Single Cavity

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