7.62×39 Ballistic Gel Test Results: AK-47 & SKS Performance Data Guide

The 7.62x39mm cartridge has been in continuous military and civilian service since 1944. It powers the AK-47, SKS, and a growing number of AR-platform rifles. Despite its global popularity, reliable ballistic gel data for this cartridge is harder to find than you might expect — most testing focuses on NATO calibers.

This guide compiles gel test results, chronograph data, and terminal performance metrics for six common 7.62×39 loads. Whether you’re evaluating hunting ammunition, checking defensive potential, or just want to understand what your range ammo does on impact, the data below gives you a clear picture. Browse our full 7.62×39 ammunition selection here.

1. What Makes 7.62×39 Tick — Cartridge Overview

The 7.62x39mm was designed by the Soviet Union as an intermediate cartridge — more powerful than a pistol round, lighter-recoiling than a full-power rifle cartridge. It fires a .311-caliber bullet (not .308) weighing between 120 and 154 grains at moderate velocities, typically around 2,300–2,400 fps from a standard 16″ barrel.

Here’s what defines the cartridge ballistically:

• Bullet diameter: .311″ (7.92mm) — slightly larger than .308 Winchester’s .308″ bullet
• Standard bullet weight: 122–124 grains (military loads), 150–154 grains (heavy hunting loads)
• Typical muzzle velocity: 2,300–2,400 fps (16″ barrel, 123gr)
• Muzzle energy: ~1,520 ft-lbs (123gr at 2,350 fps)
• Effective range: 300 yards (practical), 400 yards (maximum with iron sights)
• Case type: Rimless, bottleneck; often steel-cased in military/surplus ammo

The cartridge’s moderate velocity and heavy-for-caliber bullet give it a distinctive terminal profile. It hits harder than 5.56 NATO inside 200 yards but drops faster beyond that distance. Understanding this performance envelope is key to choosing the right load for your application.

2. How We Evaluate 7.62×39 Terminal Performance

All gel test data referenced in this guide follows the FBI protocol standard: calibrated 10% ordnance gelatin blocks, with bare gel and heavy clothing barrier tests measured at 10 feet. The metrics that matter most are:

• Penetration depth: The FBI standard requires 12–18 inches for defensive use. Hunting applications often benefit from 14–20 inches depending on game size.
• Expansion diameter: Measured as the recovered bullet’s widest point. FMJ loads won’t expand; soft points and hollow points should open to 1.5× original diameter or more.
• Weight retention: How much of the bullet’s original weight remains after impact. Higher retention means deeper, more consistent penetration.
• Temporary stretch cavity: The maximum diameter of tissue displacement during the first few milliseconds of impact. Rifle cartridges create significantly larger temporary cavities than handgun rounds.

One important note about 7.62×39 testing: most affordable ammunition in this caliber uses steel-jacketed, mild-steel-core bullets. These behave very differently in gel than copper-jacketed soft points. The data below separates FMJ/steel-core loads from expanding loads so you can make apples-to-apples comparisons.

3. 7.62×39 Ballistic Data — 6 Loads Compared

The table below summarizes performance data for six common 7.62×39 loads, tested from a 16″ barrel at 10 feet into calibrated gel:

Key takeaway: FMJ loads blow straight through gel with no expansion and extreme penetration (29–31+ inches). Expanding loads cluster in the 15–19 inch range with expansion from .48″ to .62″. The Federal Fusion and Hornady SST are the standout performers for hunting applications, balancing penetration with reliable expansion.

4. Steel-Core FMJ — What the Gel Actually Shows

Most 7.62×39 ammunition sold in the United States is steel-cased, steel-jacketed FMJ — brands like Wolf, Tula, Red Army Standard, and Barnaul. This is your range ammo, and it’s important to understand what it actually does on impact.

FMJ 7.62×39 bullets behave predictably in gel:

• No expansion. The bullet enters and exits gel at .311″ — exactly its original diameter.
• Extreme penetration. 29–32 inches is typical. That’s nearly double the FBI maximum for defensive use.
• Yaw and tumble. After 8–10 inches of straight-line travel, the bullet typically begins to yaw (turn sideways). This creates a larger temporary cavity but isn’t consistent enough to rely on for terminal effect.
• No fragmentation. Unlike M193 5.56 NATO (which fragments above 2,700 fps), 7.62×39 FMJ almost never breaks apart. The mild steel core and thick jacket keep it intact.

The practical implication is clear: FMJ 7.62×39 is a range and training round. Its 31+ inches of gel penetration translates to extreme overpenetration through soft tissue, drywall, and intermediate barriers. If you’re using your AK or SKS for anything beyond target practice, you need an expanding bullet.

5. Soft Point & Expanding Loads — Hunting Performance

The expanding loads in our data set tell a completely different story from FMJ. Here’s how each one performs:

Federal Fusion 123gr Soft Point

The Fusion is Federal’s budget hunting line, and in 7.62×39 it’s one of the best options available. The electrochemically bonded core resists separation on impact, which is why it retains 95% of its weight while still expanding to .58″ — nearly double its original diameter. At 17.5 inches of penetration, it sits right in the sweet spot for deer-sized game. This is our top recommendation for AK/SKS hunters.

Hornady SST 123gr

The SST (Super Shock Tip) is Hornady’s polymer-tipped hunting bullet. It expands more aggressively than the Fusion (.62″ vs .58″) but sheds more material in the process — 82% weight retention compared to 95%. The trade-off is a larger wound channel with slightly less penetration (15 inches). Best suited for broadside shots on deer-sized game where you don’t need deep penetration through heavy bone.

Winchester PDX1 120gr Hollow Point

Winchester designed the PDX1 as a defensive load, and it splits the difference between the Fusion and SST. At .60″ expansion, 16 inches of penetration, and 88% weight retention, it’s a solid all-around performer. The slightly lighter 120-grain bullet runs about 15 fps faster than 123-grain loads, though the practical difference is negligible.

Barnaul 125gr Soft Point

The Barnaul SP is the budget option. It’s steel-cased with a copper-washed steel jacket over a lead core with an exposed tip. Expansion is modest at .48″ — the steel jacket doesn’t open as readily as a pure copper jacket. But weight retention is excellent (97%) and penetration reaches 19.5 inches. This is plenty of bullet for close-range deer hunting inside 150 yards, and at roughly half the price per round of Federal Fusion.

Key takeaway: For hunting, the Federal Fusion 123gr is the best overall balance of expansion, penetration, and weight retention. The Hornady SST is the best choice when maximum tissue disruption matters more than deep penetration.

6. Barrel Length vs Velocity — 10.5″ to 20″ Data

The 7.62×39 cartridge was designed around the AK-47’s 16.3″ barrel, but modern platforms range from 10.5″ SBR/pistols to 20″ SKS rifles. Here’s how barrel length affects velocity with a 123-grain FMJ load:

The velocity loss rate for 7.62×39 is approximately 12–13 fps per inch of barrel. That’s less severe than 5.56 NATO (which loses roughly 25 fps per inch) because the 7.62×39 uses a faster-burning powder charge that reaches peak pressure earlier in the barrel.

Key takeaway: A 10.5″ AK pistol still delivers 2,140 fps and 1,250 ft-lbs — more energy than a .357 Magnum from a 4″ revolver. The cartridge is remarkably tolerant of short barrels, which is one reason compact AK platforms remain popular.

7. 7.62×39 vs 5.56 NATO — Terminal Ballistic Comparison

This is the comparison every AK owner encounters. Here’s what the gel data actually shows when you put these cartridges side by side:

The 7.62×39 hits harder (25% more muzzle energy) and maintains its energy advantage inside 200 yards. But M193 5.56 has a critical advantage: it fragments above 2,700 fps impact velocity, creating devastating wound channels without needing an expanding bullet. The 7.62×39 FMJ doesn’t fragment — it just punches straight through.

Beyond 200 yards, the 5.56’s flatter trajectory and lower wind sensitivity give it a clear edge for accuracy. The 7.62×39’s heavier, slower bullet drops nearly twice as much at 300 yards.

Key takeaway: Inside 150 yards with expanding ammunition, the 7.62×39 has a real energy advantage. Beyond 200 yards, 5.56 NATO is the better ballistic performer. For FMJ-only scenarios, M193’s fragmentation makes it more effective despite lower energy.

8. 7.62×39 vs 300 Blackout — The Honest Comparison

The 300 Blackout was essentially designed to replicate 7.62×39 ballistics in an AR-15 platform. How close did it get?

In supersonic form, these two cartridges are ballistic twins. The 7.62×39 has a slight energy edge from its heavier bullet, but terminal performance in gel is nearly identical when you compare equivalent expanding loads.

The 300 Blackout’s real advantage is subsonic capability. A 190-grain subsonic 300 BLK through a suppressor is whisper-quiet and still hits with authority. The 7.62×39 doesn’t have a meaningful subsonic ammunition market.

The 7.62×39’s advantage is cost. Steel-cased range ammo runs 60–70% cheaper per round than comparable 300 Blackout. Over a few thousand rounds of training, that adds up fast.

Key takeaway: If you want AR-15 compatibility and suppressor optimization, 300 Blackout wins. If you want the same ballistic performance at a fraction of the cost, 7.62×39 is the better value — especially in an AK platform.

9. 7.62×39 for Hunting — Effective Range and Load Selection

The 7.62×39 is a legitimate deer cartridge inside 200 yards, and it’s been used to harvest game far larger than whitetails across Eastern Europe and Asia for decades. Here’s how to think about it:

Minimum Energy Thresholds

Most wildlife agencies and hunting ethics guidelines recommend 1,000 ft-lbs of energy for deer-sized game. Here’s where each load type drops below that threshold:

Best Hunting Loads by Game

• Whitetail deer (broadside, 150 yards or less): Federal Fusion 123gr SP — best balance of expansion and penetration
• Hogs (close range, brush): Barnaul 125gr SP or Federal Fusion — heavy penetration through tough hide and shoulder
• Varmint/predator: Hornady SST 123gr — maximum tissue disruption, rapid expansion
• Not recommended for: Elk, moose, or bear. The cartridge lacks the energy and penetration needed for large, heavy-boned game.

Key takeaway: Keep your shots inside 150 yards with expanding ammunition, and the 7.62×39 is a perfectly capable deer cartridge. The Federal Fusion 123gr is the hunting load to beat in this caliber.

10. 7.62×39 for Home Defense — Overpenetration Data

Can you use a 7.62×39 rifle for home defense? Technically yes, but the overpenetration data demands careful load selection.

Drywall Penetration Test Results

Testing through standard interior walls (two sheets of 1/2″ drywall per wall) shows dramatic differences between load types:

• FMJ (Wolf/Tula 123gr): Penetrates 6+ walls with lethal energy. Completely unsuitable for home defense.
• Soft point (Federal Fusion 123gr): Penetrates 3–4 walls. Significant overpenetration risk in apartments or homes with thin walls.
• Hollow point (Winchester PDX1 120gr): Penetrates 2–3 walls. Better than soft point but still more penetration than defensive handgun or 5.56 loads.

For comparison, M193 5.56 NATO (55gr FMJ) typically fragments after the first wall in drywall tests, making it a significantly safer choice for interior use. This is counterintuitive — the “bigger” round is actually more dangerous to bystanders in a home defense scenario.

If You Must Use 7.62×39 for Home Defense

1. Use expanding ammunition only. Never FMJ. The Winchester PDX1 or Hornady SST are your best options.
2. Know your backstop. Even with expanding loads, plan for 2–3 walls of penetration.
3. Consider your platform. A short-barreled AK pistol with a brace is maneuverable indoors but adds significant muzzle blast and flash.
4. Attach a light. Positive target identification matters more than caliber selection.

Key takeaway: The 7.62×39 is not the ideal home defense cartridge due to overpenetration, but if it’s what you have, use expanding ammunition exclusively and understand the penetration risks. A 5.56 NATO or 9mm platform is objectively safer for interior use.

11. Frequently Asked Questions

What is the effective range of 7.62×39?

The practical effective range is 300 yards for target shooting and 150 yards for hunting with expanding ammunition. The cartridge remains lethal well beyond these distances, but bullet drop (24+ inches at 300 yards) and energy loss make precise shot placement difficult and ethical kills uncertain past 200 yards.

Is 7.62×39 more powerful than 5.56 NATO?

In terms of raw muzzle energy, yes — the 7.62×39 produces about 1,508 ft-lbs compared to 5.56’s 1,212 ft-lbs (both from 16″ barrels). However, 5.56 NATO’s higher velocity creates more dramatic terminal effects through fragmentation, especially inside 200 yards. “More powerful” depends on how you define the term.

Can you hunt deer with 7.62×39?

Yes, with proper ammunition. Use a quality expanding bullet like the Federal Fusion 123gr SP or Hornady SST 123gr, and keep your shots inside 150 yards. The cartridge delivers adequate energy and expansion for clean kills on deer-sized game at these distances.

Why does 7.62×39 FMJ penetrate so much gel?

Two reasons: the bullet doesn’t expand (maintaining its small .311″ frontal area throughout penetration), and it doesn’t fragment like 5.56 NATO FMJ. With nothing to slow it down or increase drag, the bullet simply pushes through gel in a straight line. This is why FMJ 7.62×39 is completely unsuitable for defensive or hunting use.

Is steel-cased 7.62×39 bad for your gun?

For AK-pattern rifles and SKS, no. These platforms were designed specifically for steel-cased ammunition with looser tolerances and chrome-lined chambers. AR-platform rifles chambered in 7.62×39 may experience slightly faster wear on extractors, but modern AR x39 builds handle steel-cased ammo without issues for thousands of rounds.

What barrel twist rate is best for 7.62×39?

The standard twist rate is 1:9.45″ (240mm), which is what most AK-pattern rifles use. This stabilizes bullets from 120 to 154 grains effectively. The SKS uses a similar 1:9.4″ twist. There’s no need to seek out alternative twist rates for this cartridge — the standard works for all commercially available loads.

Looking for 7.62×39 ammunition? Shop our full selection of 7.62×39 ammo at Tatted Tacticals.