.38 Special Ammo

What is .38 Special?

Smith & Wesson introduced .38 Special in 1898 as a more powerful successor to the .38 Long Colt, the cartridge that had performed poorly against Moro warriors in the Philippine-American War. The Army needed more stopping power. S&W responded with a longer case, more powder, and a heavier bullet. The result became the standard American police cartridge for most of the 20th century.

Despite its name, the bullet is .357 inches in diameter, the same as .357 Magnum. The “.38” designation comes from the approximate outside diameter of the loaded cartridge case. That dimensional overlap is why every .357 Magnum revolver chambers .38 Special, and why the cartridge remains relevant long after higher-performance options arrived.

The S&W Military & Police, the Colt Official Police, and later the K-Frame and J-Frame revolvers all chambered .38 Special. It was the standard-issue sidearm for virtually every American police department until the 1990s, when semi-automatics took over.

Today .38 Special has two jobs: carry revolver cartridge and cheap practice ammo for .357 owners. It does both well.

+P: what it means and when to use it

.38 Special +P is loaded to higher pressure than standard spec, approximately 20,000 PSI vs. 17,000 PSI standard. That pressure increase gives defensive hollow points better expansion velocity, which matters a lot from short barrels.

Not all .38 Special revolvers are rated for +P. Older and lighter-framed revolvers, including aluminum-frame J-frames and some vintage guns, should use standard-pressure loads only. Modern steel-frame revolvers (K-Frame, L-Frame) are generally +P rated. Most current alloy-frame J-frames allow occasional +P but note accelerated wear. Check your manual before assuming.

The velocity difference from a 2-inch barrel is meaningful:

Standard pressure is fine for practice. For defense from a 2-inch barrel, +P is worth it if your gun handles it.

The snub-nose problem

Most .38 Special carry revolvers have 2 to 2.5-inch barrels. Standard JHP bullets are designed to expand at velocities around 1,100 fps. From a 2-inch barrel, .38 Spl +P runs 850 to 900 fps, below the reliable expansion threshold for most hollow points.

This is the central problem with .38 Special as a defensive cartridge, and it is why purpose-designed snub-nose loads exist.

The Speer Gold Dot Short Barrel 135gr +P is the most validated option. It uses a softer lead core and thinner jacket to initiate expansion at 850 fps. Federal’s Micro HST, originally designed for short-barrel semi-autos, also performs well in .38 Spl loadings from short barrels. Hornady’s FTX (Critical Defense 110gr) uses a polymer tip that mechanically initiates expansion on impact, bypassing the velocity dependency. Standard 9mm-designed hollow points loaded into .38 Spl cases frequently will not expand from a snubby. You end up with FMJ performance in a hollow point bullet, which is the worst of both worlds.

The lesson: for snub-nose carry, load specifically matters. Not just any JHP.

Defensive ammo breakdown

These are the loads with documented gel data from 2-inch barrels.

Speer Gold Dot Short Barrel 135gr +P is the benchmark for snubby carry. Engineered specifically for 2 to 3-inch barrels. Consistent expansion at 850 fps. Electrochemically bonded jacket stays intact through barriers. The standard recommendation from serious instructors for J-frame and LCR carry.

Federal Micro HST 130gr +P brings HST’s proven bullet design (the one the Secret Service carries in 9mm) to .38 Special. The Micro variant is built for sub-3-inch barrels. Skived jacket petals unfold at lower velocity, resist clogging with clothing debris. Good choice if GDSB is backordered.

Hornady Critical Defense 110gr FTX uses a polymer-filled hollow point that triggers mechanical expansion on impact rather than relying on hydraulic pressure. Works from short barrels. Lighter bullet loses some penetration but consistently hits the FBI’s 12-inch minimum.

Federal Hydra-Shok 130gr is the original FBI .38 Spl load, standard pressure. Wide distribution, consistent performance, known track record from decades of use. Not as well-optimized for short barrels as the GDSB or Micro HST, but a solid choice if +P is off the table for your gun.

Winchester PDX1 130gr +P is the civilian version of the FBI’s service load. Bonded jacketed hollow point, dual cannelures for jacket-core retention. Performs comparably to Federal in most gel tests.

158gr LSWCHP standard pressure is the old FBI load, a lead semi-wadcutter hollow point. At snubby velocities it sometimes expands and sometimes does not. Not the top choice in 2026, but it has a legitimate track record and is not the disaster some reviewers suggest. Acceptable if the modern options are unavailable.

Gel testing data

FBI protocol results (10% ballistic gel, 4-layer denim, 2-inch barrel):

The FBI minimum is 12 inches. Purpose-designed snub-nose loads hit it. Standard 158gr LRN blows past it with no energy transfer.

.38 Special as a training caliber for .357 owners

.38 Special’s most underrated role is as training ammo. Every .357 Magnum revolver chambers it. A 50-round box of .38 Spl FMJ runs $12 to $18. A comparable box of .357 Mag runs $20 to $35. At the range, that difference adds up fast.

More importantly, .38 Spl generates substantially less recoil than full-power .357. That is not a weakness. It allows higher round counts without flinch development, which is the actual enemy of accurate revolver shooting. Run .38 Spl for all your fundamentals work. Run .357 Mag for hunting, woods carry, or when the situation calls for full power. The transition between them is instant, no magazine swap required.

One maintenance note: shooting a lot of .38 Spl through a .357 cylinder leaves a carbon ring at the front of the cylinder throat. .357 Mag cases use the full cylinder length and can stick on chambering if the throat is fouled. Clean the cylinder throats periodically with a bronze brush.

.38 Special vs. .357 Magnum

If you are choosing between a dedicated .38 Spl revolver and a .357 Magnum revolver, buy the .357. You can shoot .38 Spl through it for range practice, and you have the option to run full-power .357 Mag for defense or hunting. The .357 is strictly more capable.

The only reasons to choose a .38 Spl-only revolver: you want a lighter-weight platform (some titanium and scandium frames are .38 Spl-only due to pressure limits), the price difference matters for your budget, or you specifically do not want the ability to run full-power .357.

Price guide

.38 Special practice ammo runs slightly more than 9mm due to lower production volume, but noticeably less than .357 Magnum. That price spread is the practical argument for the “shoot .38, carry .357” approach.

Defensive loads for .38 Spl run more expensive than 9mm equivalents on a per-round basis. At 25 to 50 rounds per defensive load evaluation that is not a significant cost, but it is worth knowing.

Common myths

“.38 Special is obsolete.” It outsells most modern cartridges because the J-frame and LCR outsell most modern carry guns. The cartridge is not going anywhere. For a first-time buyer who wants simplicity, no magazine to top off, no slide to rack under stress, a J-frame loaded with Gold Dot Short Barrel is a fully defensible choice in 2026.

“+P is required for effective defense.” Not true. Federal Hydra-Shok standard pressure hits 13.8 inches of penetration in FBI gel from a 2-inch barrel. Standard-pressure loads designed for short barrels, including the old LSWCHP FBI load, meet the 12-inch minimum. +P helps, but it is not the difference between viable and non-viable.

“The wadcutter is an old wives’ tale for defense.” Actually not completely wrong. The flat-faced 148gr wadcutter punches a full-caliber hole and, at 700 fps, creates a consistent wound channel without relying on expansion. Several instructors recommend it for lightweight .38 Spl revolvers where +P is off the table. It is not the first choice, but it is not folklore either.

“You need a longer barrel for .38 Special to be effective.” Modern snub-nose-specific loads are designed for 2-inch barrels. The engineering exists. Running the wrong load from a short barrel is the actual problem, not short barrels per se.

“Steel-case .38 Spl is fine for revolvers.” Revolver cylinders are unforgiving with spent case extraction. Steel cases contract less than brass on cooling and can stick in the cylinder, making ejection difficult. Stick to brass for revolvers, especially snub-noses where reliable reload speed matters.

Firearms chambered in .38 Special

Revolvers (dedicated .38 Spl):

• Smith & Wesson J-Frame: Model 36 (steel), 442/642 (aluminum frame, concealed hammer), 638 (shrouded hammer) — the benchmark carry revolver platform
• Ruger LCR .38 Spl — polymer frame, lighter than steel J-frames, excellent double-action trigger
• Ruger LCRx — same platform with exposed hammer for single-action option
• Taurus 85, 856 (6-shot) — budget options with adequate reliability
• Charter Arms Undercover, Bulldog — compact, affordable

Revolvers that also chamber .38 Spl (.357 Magnum frames):

• S&W 686, 586 (L-Frame), 66, 19 (K-Frame)
• Ruger GP100, SP101
• Colt Python, King Cobra
• Any .357 Magnum revolver accepts .38 Special without modification

Lever-action rifles:

• Henry Big Boy .38 Spl/.357 Mag — chambers both, 10+1 capacity, easy to run
• Marlin 1894C (now Ruger-produced) — 9+1 in .357 Mag/.38 Spl
• Rossi R92 .38 Spl/.357 Mag — budget-friendly, reliable

In a 16 to 18-inch lever-action barrel, .38 Special gains 400 to 600 fps over a snubby. A 158gr load that runs 710 fps from a 2-inch J-frame runs 1,350 to 1,400 fps from a Henry Big Boy. That is a different cartridge in practical terms.

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