The Underwood XTP .357 Magnum 125gr load (Underwood Ammo part no. 123) is a box of 20 rounds of revolver ammunition from Underwood Ammo. It uses a Hornady eXtreme Terminal Performance jacketed hollow point, which is designed for deep penetration, accuracy and controlled expansion, at a rated 1700 fps and 802 ft-lbs at the muzzle. The case is nickel-plated brass. Underwood lists it for personal defense and medium game, which makes it a strong fit for a .357 Magnum carried for protection or taken afield.

Key Specifications

• The cartridge is .357 Magnum, the single designation Underwood lists for this load.
• Bullet weight is 125 grains, the weight Underwood lists for this load.
• The bullet is a Hornady eXtreme Terminal Performance (XTP), a jacketed hollow point that Underwood describes as built for deep penetration and controlled expansion.
• The bullet material is copper and lead, and Underwood states it does contain lead.
• Muzzle velocity is rated at 1700 fps, the figure Underwood publishes for this load.
• Muzzle energy is rated at 802 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 and medium game.

Frequently Asked Questions

Can this .357 Magnum load be fired in an ultra-light alloy revolver? Underwood says the ammunition itself is safe for ultra-light alloy revolvers, but that those firearms are so light that recoil can make bullets jump the crimp, so it does not suggest firing this ammo in them.

What bullet does this load use? It uses a Hornady eXtreme Terminal Performance (XTP) bullet at 125 grains, built for deep terminal penetration and controlled expansion.

Buy the Underwood Ammo XTP .357 Magnum 125gr Jacketed Hollow Point, 20 Rounds

It is a stout, fast 125-grain load for shooters who want magnum velocity with controlled expansion. Order from our Lubbock, Texas gun shop for fast, insured shipping and see more handgun ammunition.