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"High-Performance Ammunition Engineered for Maximum Ballistic Power"

Underwood Ammo is a premier American manufacturer of high-performance handgun and rifle ammunition, engineered to deliver maximum velocity, reliability, and terminal performance for defense and hunting.

5.0★★★★★(6 verified Underwood Ammo reviews)
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199
Products
119
In Stock
2013
Founded
USA
Origin

All Underwood Ammo Products (119)

Buy Underwood Ammo Handgun Ammunition .50 AE 300gr JHP 1580 fps 20/ct online Underwood Ammo Handgun Ammunition .50 AE 300gr JHP 1580 fps 20/ct Buy Underwood A425 .223 Rem 55GR Controlled Chaos 20RD Lead-Free Ammo online Underwood A425 .223 Rem 55GR Controlled Chaos 20RD Lead-Free Ammo Buy Underwood Ammo 875 9mm 90gr 20/Box Nickel-Plated Brass 1400fps online Underwood Ammo 875 9mm 90gr 20/Box Nickel-Plated Brass 1400fps Buy Underwood 9mm Luger 147GR JHP Nickel-Plated Brass Ammo 20 Rounds online Underwood 9mm Luger 147GR JHP Nickel-Plated Brass Ammo 20 Rounds Buy Underwood Ammo 138 9mmLuger+P 147gr Jacketed Hollow Point 20 Per Box/10... online Underwood Ammo 138 9mmLuger+P 147gr Jacketed Hollow Point 20 Per Box/10... Buy Underwood Hunting and Self Defense Ammunition 450 Bushmaster 300gr JSP 1950 fps 20/ct online Underwood Hunting and Self Defense Ammunition 450 Bushmaster 300gr JSP 1950 fps 20/ct Buy Underwood Ammo Lead long Flat Nose Ammunition .450 Bushmaster 360gr LFN 2449 fps 20/ft online Underwood Ammo Lead long Flat Nose Ammunition .450 Bushmaster 360gr LFN 2449 fps 20/ft Buy Underwood Subsonic Rifle Ammunition 8.6 Blackout 300gr HPBT 950 fps 20/ct online Underwood Subsonic Rifle Ammunition 8.6 Blackout 300gr HPBT 950 fps 20/ct Buy Underwood 170 .429 DE 240GR JHP Brass Ammo 20 Rounds online Underwood 170 .429 DE 240GR JHP Brass Ammo 20 Rounds Buy Underwood 940 10mm Auto Ammo 115gr Solid Copper 1700fps 20 Rounds online Underwood 940 10mm Auto Ammo 115gr Solid Copper 1700fps 20 Rounds Buy Underwood Ammo Xtreme Penetrator (Platinum Edition) Handgun Ammunition 10mm Auto 140gr Solid 700 fps 20/ct online Underwood Ammo Xtreme Penetrator (Platinum Edition) Handgun Ammunition 10mm Auto 140gr Solid 700 fps 20/ct Buy Underwood Ammo Xtreme Hunter Platinum Handgun Ammu online Underwood Ammo Xtreme Hunter Platinum Handgun Ammu Buy Underwood Ammo 679Underwood Ammo 679 Xtreme Defense Platinum 380ACP+P 68gr Solid Monolithic 20 Per Box/10 Case online Underwood Ammo 679Underwood Ammo 679 Xtreme Defense Platinum 380ACP+P 68gr Solid Monolithic 20 Per Box/10 Case Buy Underwood Ammo 678Underwood Ammo 678 Xtreme Defense Platinum 380ACP 68gr Solid Monolithic 20 Per Box/10 Case online Underwood Ammo 678Underwood Ammo 678 Xtreme Defense Platinum 380ACP 68gr Solid Monolithic 20 Per Box/10 Case Buy Underwood 874 Platinum 9mm+P 68gr Ammo 20/Box Nickel-Plated Brass online Underwood 874 Platinum 9mm+P 68gr Ammo 20/Box Nickel-Plated Brass Buy Underwood Ammo 873Underwood Ammo 873 Xtreme Defense Platinum 9mmLuger 68gr Solid Monolithic 20 Per Box/10 Case online Underwood Ammo 873Underwood Ammo 873 Xtreme Defense Platinum 9mmLuger 68gr Solid Monolithic 20 Per Box/10 Case Buy Underwood 557 50 Beowulf 350gr FMJ Ammo 20/Box 10/Case online Underwood 557 50 Beowulf 350gr FMJ Ammo 20/Box 10/Case Buy Underwood Ammo Handgun Ammunition .50 AE 300Gr FMJ online Underwood Ammo Handgun Ammunition .50 AE 300Gr FMJ Buy Underwood 465 .458 HAM'R 300GR Ballistic Tip Ammo 20RD online Underwood 465 .458 HAM'R 300GR Ballistic Tip Ammo 20RD Buy Underwood 463 .458 HAM'R 302GR Xtreme Penetrator Ammo 20RD Box online Underwood 463 .458 HAM'R 302GR Xtreme Penetrator Ammo 20RD Box Buy Underwood Ammo Rifle Ammuntion 458 SOCOM 350Gr FMJ online Underwood Ammo Rifle Ammuntion 458 SOCOM 350Gr FMJ Buy Underwood Ammo 155Underwood 155 Xtreme Penetrator 9mmLuger 115gr Solid... online Underwood Ammo 155Underwood 155 Xtreme Penetrator 9mmLuger 115gr Solid... Buy Underwood Ammo Controlled Chaos Rifle Ammunition 30-30 Win 140gr HP 2400... online Underwood Ammo Controlled Chaos Rifle Ammunition 30-30 Win 140gr HP 2400... Buy Underwood 930 .327 Federal 95GR Xtreme Defender Ammo 20RD Box online Underwood 930 .327 Federal 95GR Xtreme Defender Ammo 20RD Box Buy Underwood 719 9mm+P 147gr Hard Cast Flat Nose Ammo 20 Rounds online Underwood 719 9mm+P 147gr Hard Cast Flat Nose Ammo 20 Rounds Buy Underwood 198 .357 Magnum 158gr FMJ 1400fps 50 Rounds Ammo online Underwood 198 .357 Magnum 158gr FMJ 1400fps 50 Rounds Ammo Buy Underwood Ammo 293 Range Supply 40S&W 180gr Full Metal Jacket 50 Per Box/10 Case online Underwood Ammo 293 Range Supply 40S&W 180gr Full Metal Jacket 50 Per Box/10 Case Buy Underwood 756 .458 SOCOM 500GR Subsonic Lead-FN Ammo 20RD online Underwood 756 .458 SOCOM 500GR Subsonic Lead-FN Ammo 20RD Buy Underwood 560 .270 Win 127GR Controlled Chaos Ammo 20RD Box online Underwood 560 .270 Win 127GR Controlled Chaos Ammo 20RD Box Buy Underwood 926 .500 Auto Max 350gr JHP Ammo 2300fps 20 Rounds online Underwood 926 .500 Auto Max 350gr JHP Ammo 2300fps 20 Rounds Buy Underwood Ammo 297 10mmAuto 180gr Full Metal Jacket Flat Nose 50 Per... online Underwood Ammo 297 10mmAuto 180gr Full Metal Jacket Flat Nose 50 Per... Buy Underwood 752 .444 Marlin 335GR Hard Cast Lead Ammo 20 Rounds online Underwood 752 .444 Marlin 335GR Hard Cast Lead Ammo 20 Rounds Buy Underwood 908 .45-70 Gov +P 325GR Xtreme Hunter Ammo 20RD Box online Underwood 908 .45-70 Gov +P 325GR Xtreme Hunter Ammo 20RD Box Buy Underwood 902 .44 Mag 160gr Xtreme Hunter Solid Copper Ammo 20 Rounds online Underwood 902 .44 Mag 160gr Xtreme Hunter Solid Copper Ammo 20 Rounds Buy Underwood 900 10mm 150gr Xtreme Hunter Ammo 20 Rounds online Underwood 900 10mm 150gr Xtreme Hunter Ammo 20 Rounds Buy Underwood Ammo 864 9mm+P 68gr Xtreme Defender 20rd Nickel-Plated Brass online Underwood Ammo 864 9mm+P 68gr Xtreme Defender 20rd Nickel-Plated Brass Buy Underwood Ammo 863Underwood 863 Xtreme Defense 9mmLuger 68gr Solid... online Underwood Ammo 863Underwood 863 Xtreme Defense 9mmLuger 68gr Solid... Buy Underwood 856 .338 Lapua Mag 300gr HPBT Ammo 10rd 2700fps online Underwood 856 .338 Lapua Mag 300gr HPBT Ammo 10rd 2700fps Buy Underwood Ammo 420 223Rem 62gr Solid Monolithic 20 Per Box/10 Case online Underwood Ammo 420 223Rem 62gr Solid Monolithic 20 Per Box/10 Case Buy Underwood 40 S&W 140GR Max Expansion Ammo 20 Rounds online Underwood 40 S&W 140GR Max Expansion Ammo 20 Rounds Buy Underwood 855 .357 SIG 65GR Xtreme Defender Ammo 20 Rounds online Underwood 855 .357 SIG 65GR Xtreme Defender Ammo 20 Rounds Buy Underwood 45-70 Gov 430gr Lead-FN Ammo 20rd Box 1550fps online Underwood 45-70 Gov 430gr Lead-FN Ammo 20rd Box 1550fps Buy Underwood Ammo 45 ACP 230 gr JHP 20 Round Box online Underwood Ammo 45 ACP 230 gr JHP 20 Round Box Buy Underwood 738 .454 Casull 360GR Lead Flat Nose Ammo 20RD Box online Underwood 738 .454 Casull 360GR Lead Flat Nose Ammo 20RD Box Buy Underwood 736 .44 SW Special 200GR HC Wadcutter 20RD Ammo online Underwood 736 .44 SW Special 200GR HC Wadcutter 20RD Ammo Buy Underwood 735 .38 Special 158GR Semi Wadcutter Ammo 20RD Box online Underwood 735 .38 Special 158GR Semi Wadcutter Ammo 20RD Box Buy Underwood 733 .38 Special+P 158GR Semi-Wadcutter 20RD Ammo online Underwood 733 .38 Special+P 158GR Semi-Wadcutter 20RD Ammo Buy Underwood 727 .45 ACP+P 255GR Cast Flat Nose Ammo 20 Rounds online Underwood 727 .45 ACP+P 255GR Cast Flat Nose Ammo 20 Rounds

About Underwood Ammo

Underwood Ammo is a highly respected American manufacturer specializing in premium, high-performance ammunition for self-defense, hunting, and tactical applications. Known for pushing the boundaries of ballistic capability, the company loads its cartridges to maximum safe SAAMI pressure limits, delivering significantly higher velocities and flatter trajectories than standard factory loads. By utilizing top-tier components, including nickel-plated brass cases and advanced projectiles from industry leaders like Lehigh Defense, Hornady, and Nosler, Underwood ensures exceptional reliability and consistency. Their diverse product lineup spans specialized handgun and rifle calibers, offering shooters unmatched terminal ballistics and barrier-blind performance when it matters most.

Headquarters

Sparta, Illinois

Established

2013

Country of Origin

USA

History & Heritage

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.

Notable Products

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.

Why Choose Underwood Ammo?

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.

Ready to Shop Underwood Ammo?

Shooters choose Underwood Ammo for its uncompromising commitment to maximizing ballistic performance, offering ultra-reliable, high-velocity loads tha...

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