The Underwood .357 SIG 124gr XTP Jacketed Hollow Point from Underwood Ammo (Underwood part no. 147) loads a Hornady eXtreme Terminal Performance bullet into a .357 SIG case, sold in a 20-round box. Underwood says the XTP is designed for deep terminal penetration, great accuracy and controlled expansion, and it combines that bullet with its own load design. The 124-grain bullet leaves the muzzle at 1,475 fps with 599 ft-lbs of energy by Underwood’s figures. Nickel-plated brass cases support smooth feeding and resist tarnish in storage. Underwood publishes a G1 ballistic coefficient of 0.165 for the bullet.

Key Specifications

• Chambering is .357 SIG, the designation to match against the marking on your barrel or slide.
• Bullet weight is 124 grains, the projectile mass Underwood lists for this load.
• Bullet construction is jacketed hollow point, built to expand on impact.
• The bullet model is the Hornady eXtreme Terminal Performance (XTP), which Underwood says is designed for deep terminal penetration, great accuracy and controlled expansion.
• Muzzle velocity is listed at 1,475 fps, the figure Underwood publishes for this load.
• Muzzle energy is listed at 599 ft-lbs, Underwood’s published number for this load.
• The case is nickel-plated brass, which Underwood says improves feeding and corrosion resistance and keeps the case from tarnishing in storage.
• Box quantity is 20 rounds, the number of loaded cartridges in the box you receive.
• The G1 ballistic coefficient is 0.165, Underwood’s published figure for how well the bullet holds its speed in flight.
• Sectional density is 0.14, the ratio of the bullet’s mass to its cross-sectional area.

Frequently Asked Questions

What bullet does this .357 SIG load use? It uses a Hornady eXtreme Terminal Performance (XTP) jacketed hollow point at 124 grains. Underwood describes the XTP as designed for deep terminal penetration, great accuracy and controlled expansion.

How many rounds are in the box? Each box holds 20 loaded rounds.

Is this load suppressor safe? Underwood lists this ammunition as safe to use in a suppressor.

Buy the Underwood .357 SIG 124gr XTP Jacketed Hollow Point Ammunition, 20-Round Box

If you shoot a .357 SIG pistol and want a proven jacketed hollow point design in a 124-grain weight, this is the load to put in the magazine. Order from our Lubbock, Texas gun shop for fast, insured shipping, and check out more handgun ammunition while you are here.