Underwood Ammunition 7.62x39mm 123 Grain Lehigh Controlled Chaos Lead-Free Box of 20

(1 customer review)

Original price was: $37.99.Current price is: $30.99.

Quantity: 20 Round

Categories: ,


While taking advantage of state of the art testing equipment, this high performance ammunition by Underwood is field tested using popular, real firearms that customers are most likely to own out in the real world with all the elements you would experience. If for some reason Underwood Ammunition fails to meet performance expectations, Underwood stands by their product 100% and will make sure the customer is satisfied with every purchase. This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases.

The development of the Lehigh Controlled Chaos technology was the result of an animal control agency’s request for a no lead .243 bullet that would provide extensive wound trauma with little minimal pass through energy. Basically the idea was to burst the bullet into numerous particles at a predetermined depth creating many wounds and a large temporary cavity with shot placement at or near the central nervous system. The agency had tried copper matrix frangible rounds and found the penetration depth and particle size were less than what was require for proper terminal performance. The bullet is designed to penetrate to a specific depth and to fracture as the internal hydraulic pressure exceeds the hoop strength of the nose design. At the time of fracture, a massive energy spike is released as the particles break away and radiate outward from the initial trajectory path. This energy spike and resulting temporary cavity sends a shock wave through the animal’s circulatory and nervous systems immediately shutting down the functioning of these systems. The Controlled Chaos technology differs from the Controlled Fracturing technology in that the fracturing particles are smaller, the penetration depth of the smaller particles is less, and the initial energy transfer is greater. These features make this an excellent bullet choice for varmint hunting, animal culling, fur hunting, and personal defense.

Suppressor Safe— The projectile is machined from solid bar stock. Expansion only occurs upon impact through hydraulic energy. (They only expand when they hit “wet.”) This is not a frangible bullet produced from powdered metal.


  • Many wound channels resulting in extensive damage
  • CNC machined from solid copper or brass, not formed or swaged
  • Exceptional accuracy from the advanced manufacturing process
  • A separate base for penetration along the original trajectory
Grain Weight
123 Grains
20 Round
Muzzle Velocity
2450 Feet Per Second
Muzzle Energy
1639 Foot Pounds
Bullet Style
Fragmenting Hollow Point
Bullet Brand And Model
LeHigh Controlled Chaos
Lead Free
Case Type
Velocity Rating
Country of Origin
United States of America

1 review for Underwood Ammunition 7.62x39mm 123 Grain Lehigh Controlled Chaos Lead-Free Box of 20

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