Barnes Triple-Shock X (TSX) Lead-Free 458 Caliber 300 Grain HPFB Bullets - Box of 20

Barnes Triple-Shock X (TSX) lead-free rifle bullets in 458 caliber, 300 grain deliver the penetration and reliability serious big-game hunters demand. Built from 100 percent copper, these hollow-point flat-base (HPFB) rounds are engineered to expand on impact while maintaining structural integrity through heavy bone and dense tissue. If a one-shot kill is your standard, TSX bullets are purpose-built to deliver—they retain 100 percent of their original weight, so energy transfer and wound channel depth stay maximized from entry to exit.

Whether you're handloading for an African plains rifle, a dangerous-game backup, or a long-range hunting rig in 458, TSX bullets have earned their reputation among reloaders who refuse to compromise. The copper construction eliminates lead concerns, making these rounds suitable for use in any jurisdiction. This box of 20 gives you enough to load and test, then refine your load development without exhausting your budget on trial ammunition.

Accuracy matters, and Barnes has optimized these bullets for it. Seating depth sensitivity is real—the manufacturer recommends working in the 0.03 to 0.07-inch range from the lands, depending on your rifle's magazine and chamber geometry. This precision requirement is typical for monolithic copper bullets and rewards a thoughtful, methodical reloader with excellent consistency.

Key Features

• 100 percent copper construction—lead-free and compliant with all hunting regulations
• Hollow-point flat-base (HPFB) design expands into four razor-sharp petals for deep cutting
• 100 percent weight retention ensures maximum penetration and energy delivery
• Optimized for .458 caliber rifles—load development recommended per rifle specs
• 20 rounds per box for efficient load testing and development

Specifications

Frequently Asked Questions

What rifles does this 458 caliber bullet work in?

These 300-grain TSX bullets are designed for .458 caliber rifles. Verify your rifle's chamber and bore specifications match .458 before loading. Seating depth will vary by rifle, so expect to work in the 0.03 to 0.07-inch range depending on your magazine length and chamber geometry.

Do Barnes TSX bullets retain their weight on impact?

Yes. Unlike some expanding bullets that shed petals or core, TSX bullets are engineered to retain 100 percent of their original weight. That means all 300 grains stay in the animal, delivering consistent penetration and energy transfer through heavy bone and tissue.

Are these bullets legal for hunting in lead-restricted areas?

Yes. These are 100 percent copper construction with no lead, so they comply with lead ammunition bans in California and other jurisdictions with similar regulations. Confirm your state or region's ammunition rules before purchasing.

What's included in the box?

This box contains 20 loaded-ready TSX bullets. You'll handle all seating and priming yourself as part of your handloading process.