The Underwood Xtreme Defender 9mm Luger +P+ 90gr load (Underwood Ammo part no. 817) is a box of 20 rounds of high-pressure, lead-free defensive ammunition from Underwood Ammo. Its 90-grain solid copper bullet is rated at 1550 fps and 480 ft-lbs at the muzzle in a nickel-plated brass case. Underwood lists personal defense as the use. This is the hottest of the three 90-grain Xtreme Defender 9mm loads, and it is meant for pistols that are rated for +P+ ammunition.

Key Specifications

• The cartridge is 9mm Luger +P+, the single designation Underwood lists for this load.
• Bullet weight is 90 grains, the weight Underwood lists for this load.
• The bullet is the Xtreme Defender, a solid monolithic copper bullet.
• The bullet is lead-free solid copper, which Underwood states does not contain lead.
• Muzzle velocity is rated at 1550 fps, the figure Underwood publishes for this load.
• Muzzle energy is rated at 480 ft-lbs, the figure Underwood publishes alongside the velocity.
• The case is nickel-plated brass, as listed on the maker’s product page.
• Each box holds 20 rounds, the pack size Underwood publishes for this item.
• Underwood classes the load as supersonic, meaning it travels faster than the speed of sound.
• Underwood lists the use as personal defense.

Frequently Asked Questions

Is this Xtreme Defender load a +P+ round? Yes. The maker lists the cartridge as 9mm Luger +P+. Underwood notes that aftermarket Sig P365 conversion barrels are not recommended for use with its +P and +P+ 9mm ammunition, and that all of its testing and validation is performed with factory Sig P365 barrels.

How does the Xtreme Defender bullet work? Underwood describes the Xtreme Defender as built on its Xtreme Penetrator line, with an optimized nose flute, bullet weight and velocity. The maker states a penetration depth of up to 18 inches with a large permanent wound cavity, and says the solid copper body keeps wallboard, sheet metal and automotive glass from affecting the wound channel.

Buy the Underwood Ammo Xtreme Defender 9mm Luger +P+ 90gr Solid Copper, 20 Rounds

Choose it only for a 9mm that is built for +P+ ammunition. Order from our Lubbock, Texas gun shop for fast, insured shipping and see more handgun ammunition.