.380 ACP Ammo

What is .380 ACP?

John Browning designed .380 ACP in 1908 for the Colt Model 1908 Pocket Hammerless — a pistol with no external hammer that could be carried in a coat pocket without snagging. The design goal was a functional self-defense cartridge in the smallest possible package. The .380 case is shorter and lower-pressure than 9mm, which allows blowback-operated pistols with no locked breech — simpler, lighter, smaller.

Europeans call it 9mm Short, 9mm Kurz, or 9×17mm. In the U.S. it’s .380 ACP or .380 Auto. Same cartridge. The “.380” refers to the bore diameter in inches.

For most of the 20th century, .380 ACP was the standard European police cartridge and a common choice for compact American carry guns. Today its main use case is pocket pistols — guns that fit in a front jeans pocket — and the debate around whether it’s adequate for self-defense.

The velocity problem

The problem with .380 ACP isn’t the bullet diameter (.355”, same as 9mm) — it’s velocity. Most pocket .380s have 2.75–3.1” barrels. From those lengths:

• 95gr FMJ: ~940–960 fps, ~190–195 ft-lbs
• 90gr JHP (standard): ~900–950 fps, ~162–181 ft-lbs

Most JHP bullets are designed to expand reliably at 9mm velocities (~1,100–1,200 fps). Below ~850 fps, expansion is inconsistent — the bullet may not deform at all and just punches through like FMJ. This is why regular 9mm JHPs loaded in .380 cases don’t work well and why purpose-built .380 defensive loads exist.

Gel testing data

Tested in 10% ballistic gelatin, 4 denim layers (FBI protocol):

The FBI minimum is 12 inches. Most purpose-built .380 defensive loads meet or come close to it. FMJ blows through and keeps going — wrong choice for carry.

.380 vs 9mm: the honest answer

Modern micro 9mm pistols — Sig P365, Glock 43/43X, Springfield Hellcat — are now nearly the same size as the Glock 42 and other .380 pocket guns. That changed the calculus.

The 9mm delivers roughly 2x the energy and better expansion. In a gun that’s the same size and weight, the 9mm is objectively better. The only remaining advantage of .380 is in true pocket-pistol formats (Ruger LCP, S&W Bodyguard) where 9mm simply doesn’t fit.

If your gun choice is driven by concealability in a pocket holster, .380 is a reasonable answer with the right ammo. If you can carry a compact 9mm, there’s no performance reason to choose .380.

Short-barrel performance: what changes

Every inch of barrel costs velocity. The difference between a 2.75” LCP and a 3.6” Sig P238:

The longer-barreled .380s (P238, PPK/S, Walther CCP) extract more performance from the cartridge. Hornady’s FTX polymer-tip design forces expansion mechanically — the tip compresses and drives into the lead core on impact, making it more reliable at lower velocities than standard hollow points.

Who should carry .380 — and who shouldn’t

The only argument that actually holds up in 2026 is true pocket carry. A Ruger LCP II is 3.8 inches tall and 0.78 inches wide. A Sig P365 is 4.3 inches tall and 1.0 inch wide. That half-inch in each dimension is the entire case for .380. If the gun goes in a front jeans pocket and nothing larger fits, .380 is the answer.

There’s also a legitimate case for shooters with limited hand strength. Some compact 9mms are difficult to rack for older shooters or those with arthritis. Lighter .380s — particularly with the extended baseplate — are sometimes more manageable. That’s a real consideration, not a rationalization.

Don’t carry .380 if a compact 9mm fits under your cover garment. Micro 9mms have essentially closed the size gap. The P365 carries 10+1 vs 6+1 in a gun that’s only marginally larger than a Glock 42. If the gun goes in a waistband holster, there’s no performance reason to choose .380 over 9mm.

One more thing: the caliber matters less than the load. Most .380 defensive failures come from carrying FMJ or standard-design JHPs that won’t expand at pocket-pistol velocities. Federal HST Micro and Speer Gold Dot Short Barrel exist precisely because pocket .380s need ammo tuned to their velocity. Use them.

Brand guide

Federal HST Micro 99gr — the purpose-built .380 defensive standard. Designed specifically for 3.3–3.5” barrels. Consistent expansion and penetration in gel tests. The first choice. ~$1.10–1.50/rd.

Hornady Critical Defense 90gr FTX — FlexTip polymer tip ensures expansion even at lower velocities. Widely distributed, reliable lot-to-lot. ~$0.90–1.30/rd.

Speer Gold Dot 90gr — bonded construction, reliable expansion, law enforcement use. ~$0.90–1.30/rd.

Sig Sauer V-Crown 90gr JHP — solid performer in gel, reliable feeding in Sig platforms. ~$0.90–1.20/rd.

Winchester PDX1 95gr — bonded bullet, good penetration, widely available. ~$0.90–1.20/rd.

Blazer Brass 95gr FMJ — range training standard. Clean, reliable, low cost. ~$0.30–0.38/rd.

PMC Bronze 90gr FMJ — Korean manufacture, competitive pricing, consistent. ~$0.28–0.36/rd.

Price guide (2025–2026)

Popular .380 ACP firearms

• Ruger LCP II, LCP MAX — the pocket pistol standard; LCP MAX adds 10+1 capacity
• Smith & Wesson Bodyguard 380, Bodyguard 2.0 — integrated laser option
• Sig Sauer P238 — 1911-style controls, 3.1” barrel, excellent trigger
• Sig Sauer P365-380 — full P365 size, softer recoil, 10+1 or 12+1
• Glock 42 — the Glock grip feel in a true slim single-stack
• Walther PPK/S — the classic; 3.3” barrel, double-action/single-action
• Kimber Micro — 1911-style, aluminum frame, 6+1 capacity
• Beretta 84FS Cheetah — 13+1 double-stack, larger gun but more capacity