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Founded in 2013 by Kevin Underwood in Sparta, Illinois, the company was born out of a desire to provide shooters with higher-quality, cleaner-burning, and more powerful ammunition at a reasonable price. Operating as a family-owned business, Underwood Ammo quickly built a dedicated following among defensive shooters, hunters, and outdoor enthusiasts by pushing the boundaries of ballistic capability. In late 2025, the company announced a major expansion, investing $41 million to build a new state-of-the-art manufacturing facility in Effingham County, Georgia, to support its long-term growth.

Underwood Ammo is widely recognized for its innovative product lines, including the solid-copper Lehigh Defense Xtreme Defender, Xtreme Penetrator, and Controlled Chaos series, as well as their hard-cast lead and bonded jacketed hollow point loads.

Shooters choose Underwood Ammo for its uncompromising commitment to maximizing ballistic performance, offering ultra-reliable, high-velocity loads that deliver devastating terminal energy and superior accuracy.