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
    New
  • Bullet Weight
    180 Grain
  • Bullet Type
    Jacketed Hollow-Point (JHP)
  • Use Type
    Self Defense
  • Casing Type
    Nickel-Plated Brass
  • Quantity
    20
  • Ammo Caliber
    10mm Auto
  • Manufacturer SKU
    244
  • Primer Type
    Boxer
  • Muzzle Velocity
    1300
  • Muzzle Energy
  • UPC Barcode
    816874020866
  • Cost Per Round
    $1.20/ppr

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
  Median
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
Bullet Weight after shot (gr.) 176.9 177.7 178.5 179.2 180
Bullet Velocity (fps) 1171 1173 1176 1176 1194
Reviews Leave a Review
  • ☆☆☆☆☆

    posted on by Bogie5150

    Dang Bill, nice review I was going to do a head to head with your results, But I just threw out my last 2 Dan Wesson Silverbacks.(insert extreme sarcasm now) You got off lucky my friend. I will be posting a version using the Rock Island 1911 w/ the same ammo and reloads and if my buddy will let me a 6" S@W 610 (the old one). I use Underwood ammo all the time 357 Sig/41 Mag ect. You get what u pay for

  • ☆☆☆☆☆

    posted on by BILL

    Ah yes, item#244, I currently have 5 boxes on hand, I used to have 10 but this stuff is just such a rush to shoot I couldn't resist. Underwood is by far the most meticulous maker of custom self defense ammunition operating today.
    I dont have any ballistics gel so it was nice to find your testing here to see how it performs in that medium. As close as I can get are 1 gallon jugs of water with a heavy denim layer in front using 4 layers same as you guys. My test produced very similar results going through 4-5 jugs and denting or busting the front wall of the 5th or 6th jug. This round is simply brutal. I love 10mm. My test gun however was a 5"1911 platform Dan Wesson Silverback

  • ☆☆☆☆☆

    posted on by BILL

    Ah yes, item#244, I currently have 5 boxes on hand, I used to have 10 but this stuff is just such a rush to shoot I couldn't resist. Underwood is by far the most meticulous maker of custom self defense ammunition operating today.
    I dont have any ballistics gel so it was nice to find your testing here to see how it performs in that medium. As close as I can get are 1 gallon jugs of water with a heavy denim layer in front using 4 layers same as you guys. My test produced very similar results going through 4-5 jugs and denting or busting the front wall of the 5th or 6th jug. This round is simply brutal. I love 10mm. My test gun however was a 5"1911 platform Dan Wesson Silverback

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