Underwood .380 ACP 90gr +P XTP in Vyes Ballistics Gel

Test Gun: Ruger LCP
Barrel length: 2.75 inches.
Ammunition: Underwood .380 ACP 90gr +P XTP (Item 141)
Test media: 10% Vyse Ballistics Gel.
Distance: 10 feet.
Chronograph: Caldwell Ballistic Precision Chronograph G2.
Five shot velocity average: 1036fps
BB Calibration two shots: 4 and 3.75 inches.

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The XTP seems to one of the better performing bullets in the .380 ACP, but it still falls a little short of the 12 inch minimum penetration. While expansion with XTP bullets is generally more modest than other bullets, it makes up for that deficit with deeper penetration. The thought came to me, what if you pushed the velocity of this 90gr bullet a little more. Would you achieve more penetration? Or would the extra velocity increase expansion and retard penetration depth. Or maybe, just maybe, the front sight of your Ruger LCP Custom would come flying off halfway through the test never to be found. Luckily, I was able to get four rounds into this block and another three in the other test before it happened. Refer to my Fiocchi test for a comparison.

Underwood Ammo makes such a round. It’s a “+P” .380 using Hornady’s 90gr pill with an advertised velocity of 1200fps. Underwood doesn’t say the barrel length of their test gun, but the LCP came in less. I got a five shot average of 1036fps with a low of 996fps and a high of 1058 giving an extreme spread of 63fps. Point of aim was pretty good if using a “driver the dot” sight picture.

The first round in the bare Vyse gel block penetrated to 11.75 inches and had a recovered weight of 77.5 grains. The bullet expanded to .48 by .44 inches. No velocity was recorded. 

Round two had a velocity of 1073fps and penetrated to 10.75 inches. It’s recovered weight was 82.5 grains, and it expanded to .51 by .46 inches.

Now for the two rounds through the heavy clothing. The first round’s velocity was, 1105fps, and it penetrated to 13 inches. The recovered weight was 80.9 grains, and its expansion was .48 by .44 inches.

The second round hit the block at 1080fps and penetrated to 13.23 inches. Its expansion was .47 by .43 inches and the recovered weight was 81.6 grains.


  1. Underwood has the best version of the XTP 90 gr load in my opinion. The XTP has been tested for several years by a number of youtubers in organic and clear ballistics gel. This is the first test I’ve seen (aside from my own) of the Underwood +p load. Thank you for testing and publishing your results! It is an impressive round for the .380. I suspect in the G42 or other, longer barrel than the LCP will get closer to the published velocity and get deeper penetration.
    One thing I’ve noticed is that very few have tested the Federal Punch in .380. I hope you have one coming.


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