Underwood Ammo 10mm 155gr Gold Dot Gel Test & Results

| December 27, 2012 | 3 Comments


I test out the Underwood Ammo 155gr Gold Dot 10mm load in the Clear Ballistics FBI gel block (calibrated to mfg specs) with 4 layers of denim with the Gen4 Glock 20 (factory spring).

Chrono Data (average):

1443 fps, 716 ft/lbs energy

155gr retained weight

.812 average expansion

13.5” penetration

As you’ll see in the video, the bullet holds up pretty well with only minor deformation.

About the Author:

I love firearms and everything that goes along with them (holsters, lights, ect...). I'm a graduate of the Massachusetts Criminal Justice Training Center and a veteran of the US Army and US Air Force and spent years teaching shooting handguns, rifles, and heavy weapons.
Filed in: Ammunition
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3 Comments on "Underwood Ammo 10mm 155gr Gold Dot Gel Test & Results"

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  1. Joe says:

    I’d like to see more shots through the Chrony to establish a decent amount of data. Looks as though with those three shots it may be a bit inconsistent with a max deviation of 81fps. That’s quite a bit IMO.

    Also more shots into the gel would tell us whether it expands consistently.

  2. plouffedaddy says:

    Everyone wants different things from a video; some want more shots while others want them to be short and to the point. Unfortunately I can’t please everyone there. Also, if I shoot the block more than once tons of people say “That test it totally invalid because the block is damaged, ect….” [ask me how I know 😉 ]. Again, can’t please everyone here. These tests are just one data point I make to help share information with fellow members of the shooting community; they’re not intended to be the be all, end all tests.

    The deviation isn’t due to the round; it’s actually due to the 17lb spring in the Gen4 G20. I have several Gen3 G20s and run heavier springs in them and the same ammo gets about 50fps more and is much more consistent.

  3. CasualBlonde says:

    I’m a .45acp gal who runs 1911 platforms these days – but I’m going to have to try Underwood as a manufacturer; looks like they’re a good, small business to support.

    I’m new to your blog, and I like the way you run a review: simple, direct, concise with no pretense.

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