Underwood Ammo Xtreme Defender Handgun Ammunition .45 Auto (+P) 135gr Monolithic Solid 1335 fps 20/ct

Underwood Ammo Xtreme Defender .45 Auto (+P) ammunition delivers serious stopping power for shooters who demand reliable self-defense performance. Built around a 135-grain monolithic copper bullet pushed to 1335 fps, this load combines velocity with modern defensive design—no lead, no compromise. The nickel-plated brass cases are reloadable and non-corrosive, so you can stretch the value of each box while keeping your equipment clean.

The Xtreme Defender is engineered for the .45 ACP +P platform, hitting 537 ft-lbs of muzzle energy. That extra pressure means more consistent expansion and deeper penetration when it counts. Monolithic solid construction eliminates fragmentation concerns and delivers the kind of predictable, controlled performance that matters in a carry round. And if you run a suppressor, this ammunition is rated safe for use with one—no special precautions needed.

Twenty rounds per box means you get a workable quantity for qualification, practice, or duty carry rotation. Whether you're a .45 purist building a reliable self-defense load or testing ammunition across your platform, Underwood's commitment to quality brass and repeatable ballistics makes this a solid choice. New production, properly primed, loaded to respect the +P rating—this is handgun ammunition built for confidence.

Key Features

• 135-grain monolithic copper bullet—no lead construction
• 1335 fps muzzle velocity with 537 ft-lbs of energy
• .45 Auto +P pressure rating for modern firearms
• Nickel-plated brass cases, reloadable and non-corrosive
• Boxer-primed for standard reloading equipment
• Suppressor-safe ammunition
• 20 rounds per box

Specifications

Frequently Asked Questions

Is Underwood Xtreme Defender ammunition safe to use in a suppressor?

Yes. Underwood rates this load as safe for suppressor use, so you can run it through your can without worry.

Can I reload the brass from this ammunition?

Yes. These are boxer-primed, non-corrosive nickel-plated brass cases that can be reloaded using standard equipment.

What makes this load different from standard .45 ACP?

The +P rating means this ammunition runs at higher pressure, delivering increased velocity and energy. The 135-grain monolithic copper bullet is designed for self-defense use with controlled expansion and no lead.

How many rounds are in a box?

Each box contains 20 loaded rounds of ammunition.