9mm vs .357 Magnum

Quick comparison

The power gap

The biggest ballistic spread of any common handgun caliber comparison. .357 Magnum delivers roughly 70% more muzzle energy than 9mm with standard loads — and from a lever-action rifle, that number grows further.

The 125gr .357 Magnum JHP built a fearsome street reputation from the 1970s through the 1990s. The old "one-shot stop" statistics that made it famous have been questioned methodologically, but the cartridge's real-world track record is still widely respected. Modern 9mm JHP has closed the terminal performance gap, but the .357 Mag still delivers substantially more energy per round.

Cost per round

.357 Magnum is expensive to practice with. 9mm FMJ runs $0.17–0.25/rd. .357 Magnum FMJ runs $0.35–0.52/rd — roughly double.

The .357 Magnum has a built-in advantage here: every .357 revolver also fires .38 Special, which runs $0.20–0.34/rd. The standard practice for .357 Mag owners is to train with .38 Special and carry .357 Magnum. This reduces the cost-per-round gap dramatically for practice.

JHP defense ammo is priced similarly: $0.55–1.00/rd for 9mm, $0.55–1.10/rd for .357 Mag. Since you only carry 5–7 rounds of defense ammo in a revolver (and replace them annually), the per-year defense ammo cost difference is negligible.

Compare 9mm prices → | Compare .357 Mag prices →

Capacity versus power

The core trade-off:

The Glock 19 carries three times as many rounds as the S&W 640, with faster reloads. The S&W 640 hits 50% harder per round but gives you five shots before a slow revolver reload.

More rounds matters because you might miss under stress, need to engage multiple threats, or need to stay in the fight through a reload. The capacity advantage compounds under pressure — you can afford to miss and still have rounds left.

Recoil

.357 Magnum recoil from a full-size revolver (S&W 686, Ruger GP100 — 38–43 oz) is stout but manageable. From a lightweight snub-nose revolver (S&W 340PD at 12 oz, Ruger LCR at 17 oz), .357 Magnum recoil is punishing — it flat-out hurts.

This is a real-world problem. Many .357 Mag snub-nose owners practice infrequently because the recoil is unpleasant. They load .38 Special +P for carry instead of full .357 Mag, negating the caliber's power advantage.

9mm from any carry-size pistol produces manageable recoil that encourages practice. A shooter who practices regularly with 9mm will almost certainly shoot better under stress than one who avoids practicing with their .357 snub-nose.

The lever-action dimension

.357 Magnum has a unique capability that 9mm lacks: lever-action rifles. A .357 Magnum lever gun (Henry Big Boy, Marlin 1894, Rossi R92) extends the cartridge's performance significantly:

• 125gr JHP at 1,700+ fps from a 20" barrel (~800 ft-lbs)
• 158gr loads at 1,500+ fps (~790 ft-lbs)
• Effective deer hunting range: 100–150 yards

This makes .357 Magnum a legitimate two-gun caliber: revolver for carry, lever gun for home defense and hunting. Both guns share ammunition, which simplifies logistics.

9mm carbines exist (Ruger PC Carbine, CZ Scorpion, various PCCs) and do gain velocity from longer barrels — a 16" barrel pushes 115gr 9mm to around 1,350–1,400 fps. But .357 Mag gains proportionally more from barrel length because it uses slower-burning powder that needs the extra barrel time to fully combust. The result is that .357 Mag from a lever gun hits a different performance tier than 9mm from a PCC.

Platform considerations

9mm advantages:

• Hundreds of gun options across every size category
• Magazines and accessories are universal and affordable
• Holsters, lights, and optic mounts for every configuration
• Semi-auto reloads are fast (1–2 seconds)

.357 Magnum advantages:

• Fires both .38 Special and .357 Mag — two calibers, one gun
• Revolvers have no magazine to fumble, no slide to rack
• Mechanical simplicity and reliability
• Lever-action rifle compatibility for a two-gun system
• No brass ejection (revolver retains spent cases — good for reloaders)

When each caliber makes sense

Pick 9mm if:

• Concealed carry with maximum capacity is the priority
• Training volume matters (cheap 9mm vs expensive .357 Mag)
• Fast reloads under stress are a consideration
• You want the widest selection of modern platforms and accessories

Go with .357 Mag if:

• You want maximum per-round power from a handgun
• A revolver + lever-action rifle shared-caliber system appeals to you
• You'll actually practice with the platform (using .38 Special for training)
• Home defense with a lever gun is part of the plan
• Simplicity and mechanical reliability are priorities

Related comparisons

• 9mm vs .38 Special — Semi-auto vs revolver, lower power class
• 9mm vs .45 ACP — The classic semi-auto comparison
• 9mm vs 10mm Auto — Maximum semi-auto power vs 9mm

Related caliber pages

• 9mm ammo prices — Current pricing across all retailers
• Cheapest 9mm right now — Lowest observed prices
• 9mm price history — 30-day pricing trends
• .357 Magnum ammo prices — Current pricing across all retailers
• Cheapest .357 Magnum right now — Lowest observed prices
• .357 Magnum price history — 30-day pricing trends
• .38 Special ammo prices — The .357's practice cartridge
• .357 Magnum hollow point — Defense load options
• .357 Magnum hunting loads — Lever gun and revolver hunting

Search 9mm ammo → | Search .357 Mag ammo →