Brass vs steel case ammo: what's the difference?
What the case is made of changes how it's primed, whether you can reload it, what your gun's maker recommends, and whether your range will let you shoot it.
Every cartridge has four parts: the case, the primer, the powder and the bullet. The case is the part left over after you fire, and it's what "brass," "steel" or "aluminum" on a listing refers to. Case material is one of the biggest reasons two boxes of the same caliber can differ in cost per round. It also decides whether you can reload the case, what your gun's manufacturer recommends, and sometimes whether your range will let you shoot it.
Brass cases
Brass is the traditional case material and the one most shooters picture when they think of a cartridge.
- Reloadable. Brass is ductile enough to be resized and reused, which is why reloaders collect it. Most U.S. brass uses a single central Boxer primer that a reloading die can push out and replace.
- Seals and extracts smoothly. Brass expands against the chamber walls when fired, then springs back slightly, which helps the spent case extract cleanly.
- Widely approved. It's what most firearm manuals assume. Nickel-plated brass is brass with a plating that resists corrosion and can make feeding a little smoother. It's common in defensive loads.
Steel cases
Steel-case ammunition is common in some calibers, especially 7.62x39, and is also sold in 9mm, .223 and others. It's usually positioned as economical practice ammo.
- Coated. Bare steel rusts, so steel cases carry a protective finish, usually lacquer or polymer. Wolf, for example, describes a polymer coating it says helps feeding and extraction, and lists lacquer-coated military-style loads.
- Usually Berdan-primed. Wolf's published specs list Berdan primers across its steel-case lines. Berdan primers use two small flash holes and no central hole, so they're hard to remove and replace.
- Not practically reloadable. Between Berdan priming and steel's stiffness, steel cases are generally treated as single-use.
- Manufacturer guidance varies. Some firearms are designed to run steel-case ammo. Others aren't. SIG SAUER's own advice to new pistol owners says steel-cased ammunition "can damage your barrel and therefore we do not recommend it," and that it "may also void or compromise your pistol's warranty." Your owner's manual is the authority for your gun.
Aluminum cases
Some manufacturers make aluminum-case handgun ammunition, marketed as budget practice ammo. Aluminum cases are generally not intended for reloading. Check the manufacturer's packaging, and check your firearm maker's guidance, just as you would with steel.
Quick comparison
| Brass | Steel | Aluminum | |
|---|---|---|---|
| Primer (typical) | Boxer (most U.S. ammo) | Berdan (commonly) | Varies; check the maker |
| Reloadable | Yes | Not practically | Generally no |
| Coating | None, or nickel plating | Lacquer or polymer | Varies |
| Magnet sticks to case | No | Yes | No |
| Firearm maker approval | Widely approved | Varies; some advise against | Varies |
Range rules: case vs bullet
Range policies about "steel" usually target the bullet, not the case. Steel-core, steel-jacketed and bimetal-jacketed bullets can damage steel targets and backstops and can throw sparks. Many ranges ban any projectile that sticks to a magnet. One outdoor range's posted policy, for example, prohibits "steel core, steel jacketed, bi-metal, armor-piercing, or tracer ammunition" and tells shooters to test the bullet with a magnet. Some ranges ban steel-case ammunition entirely. Others allow it if the bullet passes the magnet test.
A lot of steel-case ammunition also uses bimetal (steel-jacketed) bullets. Wolf's spec tables list many loads that way. A box that's cheap per round may not be range-legal where you shoot.
Comparing brass and steel on Price Dope
Caliber pages let you filter by case material, so you can compare brass and steel separately. In-stock offers come first, ranked by cost per round, and every offer shows when it was last checked. Remember that a lower cost per round only helps if the ammo suits your firearm and your range. See cost per round, explained.
Price Dope doesn't sell anything; purchases are completed with the retailer. Ammunition sales are regulated at the federal, state and local levels, so follow the law where you live.
Sources
- SIG SAUER, Congratulations on buying your first pistol. Now what? (steel-cased ammunition and warranty guidance).
- Wolf Performance Ammunition, Steel cased ammo (polymer and lacquer coatings, Berdan primers, bimetal jackets in published specs).
- Angeles Shooting Ranges, Ammo restrictions (an example range policy and magnet test).
Brass vs steel case FAQ
Is steel-case ammo bad for my gun?
It depends on the firearm, and your manufacturer's guidance is what counts. Some firearms are designed with steel-case ammunition in mind. Some makers advise against it: SIG SAUER, for example, says steel-cased ammunition can damage your barrel, doesn't recommend it for its pistols, and says it may void or compromise the warranty. Check your owner's manual.
Can I reload steel-case ammo?
Not practically. Most steel-case ammunition uses Berdan primers, which are much harder to remove and replace than the Boxer primers used in most U.S. brass, and steel cases don't resize the way brass does. Reloaders generally stick to brass.
Why do some ranges ban steel-case ammo?
Usually the concern is the bullet, not the case. Steel-core or bimetal (steel) jacketed bullets can damage steel targets and backstops and can throw sparks, so many ranges prohibit any bullet that sticks to a magnet. Some ranges also ban steel cases outright. Check your range's posted rules.
How do I tell if ammo is steel case?
Look at the listing or the box, which usually states the case material. Steel cases are often coated in a gray, green or brown lacquer or polymer finish, and a magnet will stick to the case. To check the bullet for range rules, hold the magnet to the bullet itself.
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