20rds – 10mm Underwood 180gr. JHP Ammo


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Underwood Ammo 180 Grain Jacketed Hollow-Point (JHP) Ammo Details

This 10mm cartridge by Underwood sports a 180 grain jacketed hollow point projectile. The bullet, which is made by Speer, has a jacket and core which are tightly bonded together via the company’s unique Uni-Cor electrochemical process. Their separation during penetration is virtually impossible, resulting in the kind of stellar weight retention you should be excited to see from your personal defense ammunition.

Underwood especially stands by this cartridge’s brass casing, which has been nickel plated according to their Ducta-Bright 7a process. Its plating means that this round feeds remarkably reliably, has a high degree resistance to corrosion, and is easier to clean up for reloading purposes.

This cartridge further offers a flash suppressed powder, so you won’t be blinded by the light of your first shot if you ever have to fire in self-defense in a dark environment. Along with the devastating terminal performance of its bullet, that makes this round an all-around sure bet for effective self-defense.
  • Manufacturer
    Underwood Ammo
  • Condition
  • Bullet Weight
  • Use Type
    Self Defense
  • Casing Type
    Nickel-Plated Brass
  • Quantity
  • Ammo Caliber
    10mm Auto
  • Manufacturer SKU
  • Primer Type
  • Muzzle Velocity
  • Muzzle Energy
  • UPC Barcode
  • Cost Per Round

Ballistic Gel Testing

We fired 5-rounds of this Underwood Bonded 180 Grain 10mm ammo through a 4-layer fabric barrier and into ballistic gel. Using a Glock 29 (3.78" barrel) we noted an average penetration depth of 13.38" - just a hair shy of the Federal Bureau of Investigation's recommended 14" - 18" window. These rounds did fare very well in terms of expansion - coming in at .74" on average for our 5-shot sample. Take a look below to see more comparisons against other 10mm ammunition options for self-defense.
Gel test results for Underwood Ammo 180 Grain Jacketed Hollow-Point (JHP) ammo

Unfired versus Fired Round Comparison

Image detailing before and after firing 20rds – 10mm Underwood 180gr. JHP Ammo Image detailing before and after firing 20rds – 10mm Underwood 180gr. JHP Ammo

How do the results for this Underwood Ammo 10mm Auto compare to other 10mm?

20rds – 10mm Underwood 180gr. JHP Ammo Gel Test Results
Bullet Depth (in.) 12 12.1 13.4 13.5 15.9
Expanded Diameter (in.) 0.71 0.72 0.73 0.75 0.79
Expanded Weight (gr.) 176.9 177.7 178.5 179.2 180
Bullet Velocity (fps) 1171 1173 1176 1176 1194
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