Lee Black Powder Minie Mould - Single Cavity .578" 478 gr

The Lee Black Powder Minie Mould is a single-cavity casting tool built for shooters who handcast their own ammunition. Whether you're loading for a rifled musket, Civil War reenactment, or historical blackpowder rifle, this .578" mould throws 478-grain minié balls—the classic, time-tested projectile for 58-caliber and similar arms. Lee's aluminum construction gives you advantages over traditional iron and steel moulds: faster heat cycling between pours, roughly one-third less weight, and reduced hand fatigue across long casting sessions.

CNC machining ensures the cavity holds strict tolerances, producing consistent roundness and diameter from pour to pour. That precision matters when you're trying to achieve reliable performance downrange. The aluminum body also resists rust, so this mould will stay ready in your reloading bench without the babying that steel requires. Keep in mind that while the mould is sold by its nominal weight alloy designation, minor variances in actual bullet weight can occur depending on your specific alloy mix and casting technique.

If you're serious about blackpowder rifle ammunition, a dedicated minié mould is an essential tool. Lee's reputation for value and dependability in casting equipment means you get professional-grade performance without the premium price tag of boutique alternatives. This is the kind of gear that works year after year with simple care and attention.

Key Features

• Single-cavity design for .578" minié balls weighing 478 grains
• Aluminum construction resists rust and weighs roughly 33% less than steel or iron moulds
• Faster heat-up and cool-down cycles for more efficient casting sessions
• CNC-machined cavity delivers consistent roundness and dimensional control
• Reduced hand fatigue during extended casting work

Specifications

Frequently Asked Questions

What caliber rifle does this minié mould fit?

The .578" diameter is standard for 58-caliber blackpowder rifles, including rifled muskets and similar historical arms. Verify your specific rifle's bore size before ordering.

How much does the finished bullet actually weigh?

The mould is sold according to the nominal weight of 478 grains for a standard alloy. However, actual bullet weight may vary slightly depending on your specific alloy composition and casting technique, so weighing finished bullets is recommended for consistency.

Is aluminum as durable as steel or iron for casting?

Aluminum is proven and durable for casting moulds. It offers practical advantages—faster thermal cycling, lower weight, and rust resistance—with no sacrifice to the precision of the cavity itself, which is CNC machined for consistent performance.

Can I use this mould for other bullet weights or styles?

This is a single-cavity minié mould designed specifically for .578" 478-grain projectiles. If you need a different weight or style, you'll need a different mould.