5.7x28mm Ballistics: Gel Test Data, Velocity Charts & Performance Guide

1. What Is 5.7x28mm?

The 5.7x28mm was developed by FN Herstal in the late 1980s as part of NATO’s search for a replacement for the 9mm Parabellum in personal defense weapons. FN designed the cartridge alongside two firearms: the P90 submachine gun and the Five-seveN pistol. The goal was a compact, high-velocity round that could defeat body armor at close range while producing less recoil than 9mm and fitting more rounds into a magazine.

The cartridge achieves its performance by pushing very light bullets (27–40 grains) at very high velocities (1,600–2,350 fps depending on load and barrel length). It’s essentially a miniature rifle cartridge fired from pistol and PDW platforms — a bottleneck design that shares more engineering DNA with .223 Remington than with any traditional handgun cartridge.

For civilians, the 5.7x28mm has gained significant popularity since 2020, driven by new pistol designs from Ruger (57), Smith & Wesson (M&P 5.7), and PSA (Rock 5.7), plus CMMG’s Banshee AR-pattern firearms. The 20-round standard magazine capacity, flat trajectory, and minimal recoil make it attractive for home defense and range use.

Browse our selection of 5.7x28mm ammunition at Tatted Tacticals for your Five-seveN, Ruger 57, or PS90.

2. How We Evaluate 5.7x28mm Performance

Ballistic gel testing for 5.7x28mm follows the FBI protocol: calibrated 10% ordnance gelatin blocks, shots fired from 10 feet, with measurements of penetration depth, wound cavity dimensions, and bullet behavior. Both bare gelatin and heavy-clothing barrier tests are relevant for defensive applications.

The 5.7x28mm presents a unique challenge for gel testing because its terminal mechanism is fundamentally different from traditional handgun bullets. Most handgun rounds rely on expansion — the hollow point mushrooms to create a wider wound channel. The 5.7x28mm relies primarily on tumbling (yaw) rather than expansion. The long, pointed bullets rotate base-over-point as they decelerate in tissue, using their length to create a wound cavity larger than their diameter suggests. This means conventional measurements like “expanded diameter” don’t fully capture the round’s terminal effect.

Chronograph data is critical because 5.7x28mm velocity varies dramatically by platform. The same load might produce 1,650 fps from a 4.8-inch Five-seveN barrel, 2,050 fps from a 10.4-inch PS90 barrel, and 2,350 fps from a 16-inch CMMG barrel. Every velocity figure in this guide includes barrel length context.

3. 5.7x28mm Ballistic Data — 6 Factory Loads Compared

Key takeaway: Civilian 5.7x28mm loads produce 220–243 ft-lbs from a pistol barrel — roughly half the energy of 9mm. The cartridge compensates with velocity-driven terminal mechanisms (tumbling, fragmentation) rather than raw energy transfer. Do not judge 5.7x28mm by its energy numbers alone.

4. 5.7x28mm Ballistic Gel Test Results

The gel test data below covers both pistol-length (4.8″) and carbine-length (10.4″) barrels, since the 5.7x28mm’s terminal behavior changes significantly with velocity.

The most important finding in 5.7x28mm gel testing is the velocity-dependent behavior of the SS197SR and V-Max loads. From a pistol barrel at 1,655 fps, these 40-grain polymer-tipped bullets penetrate 12–15 inches and create significant wound cavities through a combination of tumbling and partial fragmentation. That puts them inside the FBI window with terminal effects comparable to many 9mm defensive loads.

From the PS90’s longer barrel at 2,034 fps, the same bullets fragment much more violently, producing shallower penetration (8–9.5 inches) with larger wound cavities. More velocity means more dramatic fragmentation but less penetration — a counterintuitive result that’s important to understand if you run a PS90 or carbine-length 5.7x28mm for home defense.

The Speer Gold Dot 40gr stands out as the only conventional expanding JHP in the lineup. It expands reliably from pistol velocities and penetrates 13.5–16 inches — the most consistent and predictable terminal performer in the 5.7x28mm caliber.

Key takeaway: From a pistol, the 40-grain V-Max loads and Speer Gold Dot deliver adequate defensive performance inside the FBI penetration window. From a PS90 or carbine, the same V-Max loads fragment too aggressively and may under-penetrate — the Speer Gold Dot is the better carbine defensive choice.

5. The Tumble Effect — How 5.7x28mm Creates Wound Channels

Unlike traditional handgun rounds that rely on hollow-point expansion to create larger wound channels, the 5.7x28mm uses its bullet geometry. The long, pointed projectile is inherently unstable in soft tissue. As it decelerates, the center of gravity (which sits behind the geometric center of the bullet) causes the projectile to rotate base-over-point — a phenomenon called yaw or tumbling.

This tumble presents the bullet’s full 21.6mm (0.85 inch) length sideways to the tissue, creating a wound channel significantly larger than the bullet’s .224-inch diameter. In gel testing, the SS190 (military load) consistently tumbles within the first 2–4 inches of penetration, generating maximum wound cavity between 3 and 7 inches deep.

The V-Max and polymer-tipped civilian loads add fragmentation to the tumble. The polymer tip initiates expansion at the nose, which then causes the jacket to break apart at the cannelure. The result is a combination wound mechanism: initial tumbling creates a large primary cavity, followed by fragmentation that distributes smaller wound channels through the surrounding tissue.

This is fundamentally different from how 9mm or .45 ACP works. A 9mm HST mushrooms to 0.60–0.70 inches and plows a consistent .60-inch channel through the entire penetration depth. A 5.7x28mm V-Max creates a narrow entry wound, then opens into a 3–4 inch diameter cavity as it tumbles, then fragments into smaller pieces that create satellite wound tracks. The total tissue disruption can be comparable, but the mechanism and wound profile are entirely different.

Key takeaway: The 5.7x28mm relies on tumbling and fragmentation rather than traditional expansion. This means gel test photos look different from typical handgun rounds, but the terminal effect — measured by tissue disruption — can be comparable to established defensive cartridges.

6. Barrel Length and Velocity — Five-seveN vs PS90 vs CMMG

No other handgun cartridge shows as dramatic a velocity increase across barrel lengths as the 5.7x28mm. The small case and high-pressure design means the powder is still burning well past the typical 4.8-inch pistol barrel.

A 39–40% velocity increase from pistol to carbine is remarkable. For comparison, 9mm gains roughly 10–15% going from a 4-inch to a 16-inch barrel. The 5.7x28mm’s small case and relatively slow-burning powder (for a handgun cartridge) mean it genuinely benefits from every additional inch of barrel in a way most pistol cartridges don’t.

From a 16-inch barrel, the 40-grain SS197SR at 2,300 fps produces 470 ft-lbs of energy — nearly double its pistol-barrel output. At that velocity, the round’s terminal behavior approaches .223 Remington levels from a short barrel, making 5.7x28mm carbines surprisingly capable defensive tools.

Key takeaway: The 5.7x28mm gains more velocity per inch of barrel than any other common handgun cartridge. A PS90 or 16-inch carbine transforms the round from a marginal defensive cartridge into a legitimate PDW performer.

7. 5.7x28mm vs 9mm — Terminal Performance Compared

On paper, 9mm wins on energy. In gel, the two cartridges produce surprisingly similar penetration depths with proper defensive loads. The difference lies in wound mechanism: 9mm creates a wider, more uniform wound channel through expansion, while 5.7x28mm creates a narrower-entry, wider-cavity wound through tumbling and fragmentation.

Where 5.7x28mm genuinely excels is shootability. With less than half the recoil of 9mm, follow-up shots are dramatically faster and more accurate. For shooters with limited hand strength — smaller-framed individuals, older shooters, or anyone with grip issues — the 5.7x28mm is significantly easier to control while still delivering adequate terminal performance.

The capacity advantage (20 rounds vs 15–17) and flat trajectory also matter in defensive contexts. But the 9mm’s advantages — lower cost, wider ammunition selection, proven track record, and more energy on target — keep it as the default defensive recommendation for most shooters.

Key takeaway: The 5.7x28mm is not a replacement for 9mm in raw terminal performance. It’s an alternative that trades energy for capacity, recoil reduction, and flat trajectory. For recoil-sensitive shooters, it may be the better defensive choice.

8. 5.7x28mm vs .22 WMR — More Than Just Expensive .22 Mag?

The comparison to .22 WMR is common because both fire small-caliber, high-velocity projectiles. But the performance gap is larger than the casual comparison suggests.

From a pistol barrel, the 5.7x28mm produces nearly 2.5 times the energy of .22 WMR. The .22 WMR loses most of its rifle-barrel velocity in short barrels — its published specs assume 18–24 inch barrels, and it drops to roughly 1,050 fps from a 4-inch revolver. The 5.7x28mm is purpose-designed for short barrels and maintains its velocity advantage across all platforms.

Centerfire ignition gives the 5.7x28mm a reliability advantage that matters for defensive use. Rimfire cartridges have inherently higher failure-to-fire rates due to priming compound distribution. In a life-or-death situation, centerfire reliability is a meaningful advantage.

Key takeaway: The 5.7x28mm delivers 2.5x the energy of .22 WMR from comparable barrel lengths with centerfire reliability. It is not “just an expensive .22 Mag” — the performance gap is substantial and well-documented.

9. Body Armor and 5.7x28mm — What Civilians Need to Know

The 5.7x28mm was originally designed to defeat body armor, and this reputation drives much of the cartridge’s mystique. Here’s what civilians need to understand: the armor-piercing capability exists only in restricted military/law enforcement loads (SS190, SS198) that use hardened steel or aluminum core penetrators. These loads are not available to civilians.

Civilian 5.7x28mm ammunition — the SS197SR, Speer Gold Dot, Hornady V-Max, and all commercially available loads — uses lead-core or polymer-tipped bullets that will not defeat Level IIIA or higher body armor. They perform against soft armor essentially the same as any other handgun caliber firing at similar velocities.

This distinction matters because some buyers purchase 5.7x28mm firearms specifically for perceived armor-piercing capability. Civilian ammunition does not have this capability. If armor defeat is part of your defensive calculus, understand that off-the-shelf 5.7x28mm ammo won’t penetrate standard body armor any better than 9mm.

Key takeaway: Civilian 5.7x28mm ammunition does not penetrate body armor. The AP capability is restricted to military/LE loads with specialty penetrator cores that are not commercially available.

10. Platform Guide — Which 5.7x28mm Firearm Is Right for You?

The FN Five-seveN remains the benchmark: proven reliability, 20-round capacity, and the lightest recoil of any full-size defensive pistol. The Ruger 57 offers similar performance at roughly 60% of the price. The PS90 with its 50-round magazine and carbine-length barrel transforms the cartridge into a genuine PDW performer, though the 16-inch civilian barrel and bullpup controls take some getting used to.

For an AR-pattern shooter, the CMMG Banshee in 5.7x28mm uses a radial-delayed blowback system that runs suppressed extremely well. With a short barrel and can, it’s one of the quietest semi-auto setups available — the 5.7x28mm’s high velocity keeps it supersonic, but the low powder charge and efficient suppression make for a remarkably pleasant shooting experience.

Key takeaway: For a pistol, the FN Five-seveN or Ruger 57 are the best bets. For a home-defense carbine, the PS90 offers unmatched capacity. For suppressed use, the CMMG Banshee is hard to beat.

11. Frequently Asked Questions

Is 5.7x28mm good for self-defense?

With proper ammunition (40-grain V-Max or Speer Gold Dot), the 5.7x28mm meets the FBI’s minimum penetration requirements from a pistol barrel. It’s not as proven as 9mm, and its energy is lower, but the combination of 20-round capacity, minimal recoil, and adequate gel test results makes it a viable defensive choice — particularly for recoil-sensitive shooters.

Can 5.7x28mm penetrate body armor?

Only military/law enforcement loads with hardened steel or aluminum penetrator cores (SS190, SS198) can defeat soft body armor. All commercially available civilian ammunition uses lead-core or polymer-tipped bullets that perform against armor the same as any standard handgun round.

Why is 5.7x28mm ammo so expensive?

Lower production volume, bottleneck case manufacturing complexity, and limited competition in the marketplace all contribute to higher per-round costs. Prices have decreased significantly since 2020 as more manufacturers (Federal, Hornady, Speer) entered the market, but 5.7x28mm still costs roughly 2x what 9mm costs per round.

Is the FN Five-seveN worth the price?

The Five-seveN’s combination of 20-round capacity, minimal recoil, and flat trajectory is unique among full-size pistols. If those characteristics match your needs — particularly low recoil and high capacity — the premium price is justified. If you want a conventional defensive pistol, a quality 9mm delivers more terminal energy at roughly half the total cost of ownership.

What is the effective range of 5.7x28mm?

From a pistol, the 5.7x28mm is effective for defensive use inside 50 yards — similar to any handgun. From a PS90 or carbine barrel, the flat trajectory and retained velocity make 200-yard shots on targets practical. For terminal effectiveness on game or threats, 100 yards from a carbine is a reasonable maximum.

Ready to load up your Five-seveN, Ruger 57, or PS90? Browse our full selection of 5.7x28mm ammunition at Tatted Tacticals.