Underwood Ammo offers this .458 HAM’R 302gr Xtreme Penetrator load (Underwood part no. 463) in a 20-round box. The bullet is a solid-copper Lehigh Defense Xtreme Penetrator with a blunt, uniquely shaped nose that Underwood says maximizes penetration and feeds reliably from a magazine. Underwood rates it at 2100 fps and 2958 ft-lbs at the muzzle and lists it for medium, large and dangerous game. The bullet contains no lead, and Underwood states that the round is not for use in firearms chambered in .458 SOCOM.

Key Specifications

• The cartridge designation is .458 HAM’R, the designation Underwood uses for this load.
• Bullet weight is 302 grains, the weight Underwood loads in this solid-copper Xtreme Penetrator.
• The bullet is a solid-copper Xtreme Penetrator, a lead-free Lehigh Defense bullet with a blunt, penetration-focused nose.
• Underwood rates muzzle velocity at 2100 fps, a supersonic figure that tells you what to expect at the muzzle.
• Muzzle energy is listed at 2958 ft-lbs, the figure to compare against other loads in this cartridge.
• Each box contains 20 loaded rounds, which is the quantity you receive with this listing.
• Sectional density is 0.21, the ratio of the bullet’s mass to its cross-sectional area.
• The case is brass, a reloadable case.
• The bullet is lead free solid copper, which Underwood states contains no lead.
• The G1 ballistic coefficient is 0.21, a number Underwood publishes alongside the load.

Frequently Asked Questions

Can I fire this in a rifle chambered in .458 SOCOM? No. Underwood prints a notice on this load that it is not for use in firearms chambered in .458 SOCOM. It is a .458 HAM’R cartridge and should be used only in .458 HAM’R chambers.

Is the Xtreme Penetrator bullet lead free? Yes. Underwood describes it as solid copper, lead free and CNC machined, and states that the bullet in this product does not contain lead.

How does the Xtreme Penetrator work? Underwood says its unique nose raises the hydraulic velocity to create high pressure spikes and a larger permanent wound column, with over twice the penetration of most expanding bullets, and that the blunt nose delivers initial energy transfer with straight, deep penetration.

Buy the Underwood .458 HAM’R 302gr Xtreme Penetrator, 20-Round Box

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