Lee Black Powder Minie Mould - Single Cavity .540" 415 gr

The Lee Black Powder Minie Mould in .540" with a 415-grain cavity is built for shooters who cast their own projectiles for traditional muzzleloaders and black powder cartridge rifles. This single-cavity mould lets you produce consistent minié balls one at a time, giving you full control over your handloading process and the ability to dial in exactly the performance you need for your rifle.

Lee's aluminum construction is a smart choice for bullet casting. Unlike steel or iron moulds, aluminum resists rust, heats and cools faster, and weighs roughly a third less—which means less hand fatigue during longer casting sessions. The cavity is CNC machined to hold precise dimensions and roundness, so each cast ball meets your specifications. That consistency matters when you're tuning loads for accuracy and reliability.

Keep in mind that while this mould is rated for the suggested alloy weight, slight variations can occur from batch to batch. That's normal and doesn't affect the mould's performance or your ability to produce quality ammunition. Whether you're loading for competition, hunting with a traditional rifle, or just prefer the hands-on approach of cast ammunition, this Lee mould is a durable, practical tool that won't let you down.

Key Features

• Single-cavity design for methodical, controlled casting
• Aluminum construction resists rust and cycles heat faster than steel or iron
• Weighs roughly 33% less than steel moulds, reducing hand fatigue
• CNC-machined cavity for consistent roundness and size control
• .540" diameter, 415-grain minié ball specification

Specifications

Frequently Asked Questions

What's the difference between a single-cavity and multi-cavity mould?

A single-cavity mould produces one bullet at a time, giving you a slower but more deliberate casting pace. It's ideal for precision work where you want to inspect each ball and have full control over the process. Multi-cavity moulds cast more bullets per cycle but require more even heating and handling.

Will this mould work with different alloys?

This mould is rated for suggested alloy weights, and slight variances can occur depending on the specific mix and temperature of your casting alloy. Stick to proven black powder casting alloys and you'll get reliable, consistent results.

Why choose aluminum over steel or iron for casting moulds?

Aluminum heats and cools faster, resists rust without special care, and is significantly lighter. The faster thermal cycling can actually improve your casting rhythm and reduce fatigue—important when you're casting dozens or hundreds of balls. Steel and iron moulds are heavier and require more maintenance to prevent corrosion.

Is this mould suitable for cartridge rifles or just muzzleloaders?

The .540" 415-grain minié ball specification is designed for black powder cartridge rifles and traditional muzzleloaders. Check your rifle's specifications to confirm compatibility before ordering.