Superhard Bullet Alloy, 2-pound ingot, (70% Lead/ 30% Antimony)

Superhard Alloy (Pb 70% / Sb 30%) Ingot – Extreme Hardening Alloy – Sold by Rock Shot Products

Rock Shot Products Superhard Alloy is a high-antimony, extreme hardening alloy engineered for reloaders, bullet casters, and metalworkers who demand maximum control over hardness, strength, and performance.

This powerful blend—approximately 70% Lead / 30% Antimony—is specifically designed to be used as a hardening additive, allowing you to transform soft lead into high-performance casting alloys with precision. When standard alloys don’t cut it, Superhard gives you the ability to build exactly what you need.

Why Choose Superhard Alloy from Rock Shot Products

• ~30% Antimony content for serious hardening capability
• Ideal for custom alloy blending and BHN tuning
• Converts soft lead into durable, high-performance casting material
• Clean, consistent composition for repeatable results
• Perfect for bullet casting, specialty alloys, and foundry applications
• Made in the USA
• Built for experienced casters—not low-grade scrap blends

Product Specifications

• Alloy Composition: ~70% Lead / ~30% Antimony
• Form: Solid ingots (Rock Shot Products format)
• Primary Use: Alloy hardening, BHN control, custom blends
• Application: Bullet casting, metalworking, specialty alloy production
• Origin: Made in USA

Why Use Superhard Alloy

Superhard alloy is not a finished casting alloy—it’s a tool for precision control.

Add small amounts to softer lead or existing alloys to:

• Increase hardness (BHN)
• Improve wear resistance and durability
• Reduce deformation at higher velocities
• Fine-tune your alloy for specific applications

This gives you complete control, instead of being locked into pre-mixed alloys that may not meet your needs.

Performance Advantage

Many suppliers offer “hard” alloys with unknown or inconsistent antimony levels. Rock Shot Products Superhard Alloy delivers a true high-antimony composition, so you know exactly what you’re working with every time.

No guesswork. No weak batches. No inconsistent results.

Built for Casters Who Want Control

If you’re serious about your casting process, Superhard Alloy is an essential addition to your material lineup. Whether you're pushing performance limits or dialing in a precise blend, this alloy gives you the control that off-the-shelf products simply can’t match.