The Hornady Sub-X (Subsonic eXpanding) .458 Caliber 410gr bullet is a component bullet from Hornady (brand part no. 45052) built to deliver deep penetration below the speed of sound. Sub-X features a lead core, and long grooves cut into its gilding metal jacket combine with a flat profile and the patented Flex Tip insert seated in the bullet’s hollow-point cavity to help it expand reliably even at the low velocities subsonic loads produce. Cannelures provide positive case crimp, making Sub-X well suited to semiautomatic weapons that need dependable feeding.

Key Specifications

• This bullet is sized to .458 Caliber, built for large-bore subsonic rifle loads.
• At 410 grains, it’s a heavy-for-caliber design that stays subsonic at typical velocities.
• Bullets ship 50 to a box, enough for a full load-development cycle.
• This is a Sub-X (Subsonic eXpanding) bullet, purpose-built for below-the-speed-of-sound loads.
• A lead core provides the mass needed for deep penetration at reduced velocity.
• Long grooves in the gilding metal jacket work with a flat profile to aid reliable expansion.
• The patented Flex Tip insert sits in the hollow-point cavity to trigger expansion at low velocity.
• Cannelures provide positive case crimp for dependable feeding in semiautomatic weapons.
• Each box carries a 3.025-lb shipping weight, worth factoring in when ordering in quantity.

Frequently Asked Questions

What does ‘Sub-X’ mean? Sub-X stands for Subsonic eXpanding — the bullet is built specifically to expand reliably at the low velocities produced by subsonic loads.

What does the Flex Tip insert do? It sits inside the bullet’s hollow-point cavity and helps trigger reliable expansion even at reduced, below-the-speed-of-sound velocities.

Is this bullet suited to semiautomatic rifles? Yes, the cannelure provides positive case crimp for dependable feeding in semiautomatic platforms.

Buy the Hornady Sub-X .458 Caliber 410gr Bullets

Handloaders building quiet, subsonic .458-caliber loads will get reliable low-velocity expansion from Sub-X’s patented Flex Tip design. Order it from our Lubbock, Texas gun shop and browse the rest of our reloading bullets selection.