Ammunition

45 Super is externally/dimensionally identical to 45 ACP or 45 ACP +P and is designed to be used in 45 ACP Semi-Auto pistols that have been modified with a stronger than normal recoil spring and a shock buffer, plus a few other modifications. While you...

45 Super is externally/dimensionally identical to 45 ACP or 45 ACP +P and is designed to be used in 45 ACP Semi-Auto pistols that have been modified with a stronger than normal recoil spring and a shock buffer, plus a few other modifications. While you...

Whether you punch paper, shoot steel, or use your handgun for hunting, we ensure you have the finest accuracy, consistency, and overall quality. We utilize Nosler® Sporting Handgun™ bullets for their Alloy Jacket. Their tapered jacket is built...

Hi-Tek coating allows you to enjoy the benefits of a hard-cast projectile and the cleanliness normally seen in copper jacketed/plated rounds. Hi-Tek is a polymer based compound* that not only reduces fouling in your barrel, but also substantially reduces...

The Underwood .45-70 Gov +P 225 Grain Xtreme Hunter is a high-performance round designed for hunters who demand maximum power and precision. Loaded with a 225-grain Xtreme Hunter bullet, this +P cartridge offers increased velocity and energy, delivering...

This ammunition is not to be used in Springfield Trapdoor rifles and its replicas/reproductions. Underwood Ammo’s hard cast featuring a new “Black Cherry” coating. Equipped with new enhancements from our previous Hi-Tek coating. Our...

This ammunition should not be used in antique firearms. It is manufactured for use in modern firearms in good condition only, this ammunition could damage older and weaker firearms such as Trapdoor Springfields. This ammunition is recommended for use in...

This ammunition is not to be used in Springfield Trapdoor rifles and its replicas/reproductions. The optimum hunting round has arrived. The Xtreme Hunter (XH) was born from the incredibly popular Xtreme Defender product line. Like the XD, the Xtreme...

The Underwood .450 Bushmaster 245 Grain Xtreme Penetrator is engineered for those who demand maximum performance and stopping power. Each cartridge features a 245-grain Xtreme Penetrator bullet, designed for deep penetration and superior terminal...

Underwood Ammo™ XTP rounds are notable for their power and accuracy. We utilize Hornady eXtreme Terminal Performance (XTP) bullets which are designed for deep terminal penetration, great accuracy and controlled expansion. We combine Hornady...

Underwood Ammo’s hard cast featuring a new “Black Cherry” coating. Equipped with new enhancements from our previous Hi-Tek coating. Our “Black Cherry” coating is a  polymer-based compound; its thermal stability allows...

Underwood Ammo’s hard cast featuring a new “Black Cherry” coating. Equipped with new enhancements from our previous Hi-Tek coating. Our “Black Cherry” coating is a  polymer-based compound; its thermal stability allows...