20rds - 10mm Underwood 200gr. Nosler JHP Ammo

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Underwood Ammo 200 Grain Jacketed Hollow-Point (JHP) Ammo Details

Underwood ammunition is manufactured in Illinois and specifically intended to meet the needs of hunters, competitive shooters, and citizens that keep firearms for self-defense. The Underwood company has a great reputation for innovation thanks to their casting methods and quality component selection. These 10mm Auto rounds were made for defensive carry as well as for backup guns that are coveted in bear country. Each cartridge is built using a reloadable brass casing that is nickel-plated for a few benefits: the nickel prevents sweat, humidity, and moisture from corroding the brass and also lowers friction so that cycling is made to be more reliable.

Each casing is fitted with a non-caustic Boxer primer for dependable ignition that won't damage your pistol over time. The round is topped off with a 200-grain JHP (jacketed hollow point) from Nosler which matches common heavyweight loads for surefire function in common handguns like Bren Tens and Glock 20s. Nosler's JHP design has a deep cavity and copper jacket which rounds off the border of the cavity mouth in order to make smooth contact with a feed ramp with no hiccups. Upon contact with a target, the projectile will experience wide expansion while transferring devastating energy to the vital organs. That makes this round an excellent choice for handgun hunting or personal protection.
  • Ammo Caliber
    10mm Auto
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Gel test Results


As you hunt for the best self-defense 10mm Auto ammo, we thought you might enjoy seeing the results of some testing we recently conducted with calibrated Clear Ballistics gelatin.

We shot five of these Underwood Ammo rounds through a four-layer cloth barrier using a Glock 29. The results are detailed in the video you see above as well as the photographs. Through the charts, you should get a great idea how this Underwood Ammo ammo stacked up relative to other 10mm Auto ammo products available to American shooters.

To get a better sense of our tests, be sure to check out all the protocols we followed when conducting our tests to determine the best self-defense ammo.

Unfired versus Fired Round Comparison

Image detailing before and after firing 20rds - 10mm Underwood 200gr. Nosler JHP Ammo Image detailing before and after firing 20rds - 10mm Underwood 200gr. Nosler JHP Ammo

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

20rds - 10mm Underwood 200gr. Nosler JHP Ammo Gel Test Results

Bullet Depth (in.) 19.5 19.8 19.8 20.5 22
Expanded Diameter (in.) 0.7 0.77 0.79 0.81 0.88
Bullet Weight after shot (gr.) 197.1 197.7 197.8 198.8 199.4
Bullet Velocity (fps) 1222 1225 1240 1254 1272


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