Federal launched their 380 Auto HST load at the 2015 SHOT Show. This was big news for those of us that have tested, or watched other people test, ammunition loaded with HST projectiles. Without researching it, I can't tell you exactly how many test shots of HST I've personally sent into gel blocks over the years. I can say for certain that my gel blocks have caught more HST bullets than any other projectile brand. I was always curious why Federal skipped 380 Auto in the HST line when they offer HST in 9mm, .357 Sig, 40 S&W, and 45 Auto/GAP.
|Every caliber of HST has a slightly different bullet profile|
If you follow the blog or YouTube channel, then you may remember that the 9mm +P HST 124 grain load is a personal favorite of mine. I've tested it frequently in many different barrel lengths. I have not tested the standard pressure 9mm HST 124 grain very often. Viewers and Readers seem to like the 9mm vs. 380 Auto comparison test format so this is another one of those tests.
In the video, I added a short discussion about how the recovered rounds are measured. This measurement practice of averaging the largest and smallest expanded diameters is equal parts art and science. Recovered bullets are rarely uniform in circumference so extra care is needed to accurately measure the key dimensions.
With bullets that produce very large expanded petals, such has HST, the average expansion diameter may look too small or misleading. It isn't my intention to mislead anyone. I understand this method of measuring recovered bullets is the standard practice used by professional ballistics researchers so I have adopted their best practice. If you are reading this, then you have the benefit of seeing the data sheets below with the minimum, maximum, and average expanded diameter.
Well, enough of that. Let's get on with the test.
Step 1) Measure and record temperature and relative humidity.
Step 2) Run a 5 shot velocity average over a ProChrono Digital Chronograph at a distance of 10 feet.
Step 3) Run various terminal test shots, with and without simulated clothing barriers, into a block of Clear Ballistics Gel that has a similar density to 10% ordnance gelatin. Shot distance is 10 feet.
Step 4) Run a 600 fps calibration test bb shot into the Clear Ballistics gel block and record penetration depth.
9mm Data Sheet
380 Auto Data Sheet
Video Documentation of the Test:
Direct link to video on YouTube
Pick or Pan:
The Federal HST 9mm 124 grain continues to impress with very good performance from long and short barrel handguns. The only fault in this test was the limited expansion and penetration exceeding 18 inches with the heavy denim test shot. The additional velocity of the +P version of this load may allow the bullet to expand to a greater diameter and penetrate less. It might be a better choice if you may encounter heavy clothing barriers and fear excessive penetration.
The HST 380 Auto is a bit of a mystery for me. The packaging end flap has an image of a small handgun with the word MICRO directly under it. I interpret that as Federal telling the consumer that this load was specifically developed for short barrel handguns. Our test pistol is a little longer than most micro 380 Autos on the market so we should have met, or exceeded, the published velocity specification of 1030 fps for this load. Instead we came in a full 100 feet per second slower than specification.
Even at the lower than specified velocity, the expanded 380 bullets were larger than their 9mm counterparts in two of the four test scenarios. That's the good news. The bad news is the 380 bullets expanded too much and limited the penetration depth of the bare gel and light clothing test shots. The denim test shot was unfortunately the slowest of the 4 test shots and it completely failed to expand.
Both the 9mm and 380 Auto performed well in the heavy denim and simulated bone test.
For me, the HST 9mm 124 grain is a pick. It performed well in all test scenarios from our 3" barrel test pistol. Sadly, I will have to pass on the HST 380 Auto 99 grain due to insufficient penetration and failure to expand in all test scenarios. Ammunition makers constantly refine their ammunition to improve performance. I'll try the 380 Auto again in 12 to 18 months and see if performance improves.
Disclaimer....This test should not be considered an endorsement or recommendation for the product(s) tested. All tests represent actual performance in ballistics testing media. Terminal performance in all other media will show different results. It is up to each individual to make their own personal decision on which specific ammunition to use for their needs. It's also critically important to test any ammo in YOUR SPECIFIC FIREARM before relying on it for any purpose.
Ammunition labeled as +P or +P+ should only be used in firearms that have been certified by the manufacturer as safe for the additional pressures generated by these ammunition types.