Underwood Ammo‘s XTP jacketed hollow point in .40 S&W (brand part no. 223) loads a 155-grain bullet to a brisk 1300 feet per second for shooters who want a supersonic defensive round with real muzzle energy. Underwood builds the load in non-corrosive, boxer-primed cases so it can be reloaded, and finishes those cases in nickel plating for smoother feeding and easier visual inspection. The XTP’s hollow point cavity is designed to expand on impact, and Underwood backs the round with muzzle energy around 582 foot-pounds, putting real weight behind the expansion. Field-tested in duty-style pistols rather than test barrels alone, this is a load built for shooters who carry .40 S&W for personal defense and want a proven hollow point behind it.

Key Specifications

• The chambering is .40 S&W, a proven defensive semi-auto cartridge with a long service history.
• The bullet weighs 155 grains, a common defensive weight balancing speed and mass in .40 S&W.
• Bullet construction is jacketed hollow point (XTP), built to expand reliably on impact.
• The hollow point cavity is engineered to open on impact, increasing bullet diameter and the resulting wound channel.
• Muzzle velocity reaches about 1300 feet per second, supersonic for this load and quick off the muzzle.
• Muzzle energy runs around 582 foot-pounds, substantial output for a defensive .40 S&W round.
• Because it exceeds the speed of sound, the round is supersonic, producing a crack in addition to the muzzle report.
• Cases are nickel-plated brass, boxer-primed and non-corrosive, and reloadable for handloaders.
• Underwood loads the round to be safe for use in a suppressor, though the supersonic crack remains audible.
• Each box holds 20 rounds, a standard defensive-ammo box count.

Frequently Asked Questions

Does the XTP bullet expand in .40 S&W? Yes, the jacketed hollow point cavity is engineered to open on impact, increasing the wound channel while the bullet holds together.

Is this ammunition suppressor safe? Yes, Underwood lists this load as safe to run through a suppressor, though at 1300 fps it remains supersonic and will still produce a crack.

Can I reload the brass? Yes, the nickel-plated brass cases are boxer-primed and non-corrosive, making them reloadable.

Buy Underwood Ammo XTP .40 S&W 155gr JHP

A defensive .40 S&W pistol deserves a load that has been proven in real guns, not just test barrels, and Underwood built the XTP line around that standard. Carry it with confidence that the hollow point will expand and the case will hold up if you decide to reload. Browse more of our handgun ammunition selection and order from our Lubbock, Texas gun shop for fast shipping to your door.