Federal HST 380 Auto 99gr — HST Micro (P380HST1S)

Federal HST 380 Auto 99 Grain JHP — HST Micro (P380HST1S)

Federal HST 380 Auto 99-grain (P380HST1S) is a 380 Auto personal defense load with the 99-grain HST jacketed hollow point, listed by Federal at 935 fps. Federal catalogs it in the HST Micro line, which the company positions for micro-compact and short-barrel pistols.

Specifications (from Federal): 380 Auto · 99 gr · HST JHP · 935 fps · 20 rounds · P380HST1S (HST Micro).

Federal markets HST as a duty line; the Micro positioning and design statements are the manufacturer’s.

Federal product overview (manufacturer description)

Federal describes the Personal Defense HST line as ammunition engineered for consistent expansion, optimum penetration, and reliable terminal performance, and lists HST as a law-enforcement duty load. According to Federal:

• The specially designed hollow point is built to expand reliably through a variety of barriers and resists plugging as it passes through them.
• Expanded diameter and weight retention are designed to reach the penetration wanted for personal defense without overpenetrating; Federal states the jacket and core hold together for nearly 100 percent weight retention.
• Federal cites superior performance in the FBI test protocol that agencies use to assess and select duty ammunition.
• A specific bullet nose profile, a nickel-plated case, and a high-performance primer are specified for function and reliability.

These are Federal’s published statements, presented here for reference and attributed to the manufacturer. Independent ballistic-gel tests of HST loads are widely available for third-party results.

Specifications

Source: Federal Ammunition product page, 2026-09-23. Price and stock from our catalog.

Ballistics

Federal’s published data for P380HST1S (3.75-inch test barrel). Charts rendered from Federal’s figures; real-world results vary with barrel length and firearm.

Velocity (feet per second)

Energy (foot-pounds)

Average range (bullet path in inches, zeroed at 25 yд)

FAQ

1. What is HST Micro? Federal states HST Micro is tuned for micro-compact and short-barrel pistols. Confirm suitability for your firearm.
2. Grain weight? 99 grain in 380 Auto.