The short version
If you own a gun marked .357 Magnum, you can shop both aisles. Most owners practice with .38 Special because it is cheaper, quieter and easier on the hands, and save Magnum loads for hunting, the outdoors or full-power practice.
If you own a gun marked .38 Special (or .38 Special +P), you buy .38 Special only. That is the entire compatibility rule. Read the barrel and the owner's manual, not the box art, and you won't go wrong.
Everything else in this guide is about why that rule exists and how to pick the right load for what you actually do.
Same bullet, longer case
Both cartridges fire a bullet of about .357 inches in diameter. The ".38" name is a holdover from older measurement habits; our guide to why cartridge names make no sense covers how that happened.
The difference is the case. The .38 Special case is about 1.155 inches long. The .357 Magnum case is about 1.290 inches long, roughly an eighth of an inch more. That extra length was a deliberate safety choice when the Magnum was introduced in 1935: it keeps the hotter round from chambering in older .38 revolvers that were never built for it.
| .38 Special | .357 Magnum | |
|---|---|---|
| Introduced | 1898 | 1935 |
| Case length (approx.) | 1.155 in | 1.290 in |
| SAAMI max average pressure | 17,500 psi (20,000 psi for +P) | 35,000 psi |
| Fires in a .357 Magnum gun? | Yes | Yes |
| Fires in a .38 Special gun? | Yes | No |
| Typical role | Practice, target, carry in small revolvers | Hunting, outdoors, full-power carry |
Pressure figures are SAAMI's published maximum averages. Individual loads run below them, and makers list their own velocity figures.
Recoil, blast and what that means for carry
Doubling the pressure does exactly what you would expect. A .357 Magnum load leaves the barrel much faster, recoils harder and produces far more noise and muzzle flash, especially from a short barrel.
In a full-size steel revolver with a 4-inch or longer barrel, many shooters handle Magnum loads well. In a small, light carry revolver, the same load can be punishing enough that follow-up shots slow down and practice becomes something you avoid. That is a real cost, not a toughness test.
For that reason, plenty of people who own a small .357 carry .38 Special +P or a reduced-recoil Magnum load instead. The right answer is the most powerful load you can shoot accurately and quickly, verified at the range in your own gun. Our guide on how to vet carry ammo walks through that process.
Buying .38 Special
.38 Special is one of the most widely made handgun rounds in the US, which keeps it easy to find. You will see three broad families:
- Target and practice loads with lead round-nose, lead wadcutter or full metal jacket bullets. Wadcutters punch clean holes in paper and are traditionally mild.
- Standard-pressure defensive loads with hollow point bullets, aimed at older or lighter revolvers.
- +P loads, which run at a higher pressure ceiling. Only use them in a gun the maker says is rated for +P. Our +P explainer goes deeper.
Ammunition Depot groups current listings on its .38 Special ammo page, where you can filter by bullet type and box size.
Buying .357 Magnum
The Magnum shelf is more varied because the cartridge does more jobs. Light bullets (around 110 to 125 grains) are common in defensive loads. Middle weights around 158 grains are the traditional all-rounder. Heavier bullets, often 180 grains and up, are aimed at hunting and outdoor defense, especially from lever-action rifles.
Read the box for the intended use. A fast-expanding defensive hollow point and a heavy hunting bullet behave very differently, and the maker usually says which job it was built for. You can browse current options on Ammunition Depot's .357 Magnum ammo page.
Lever guns and semi-autos: the exceptions
Revolvers don't care much about case length; the cylinder just holds whatever you put in. Guns that feed from a tube or magazine are different.
- Lever-action rifles chambered in .357 Magnum are often listed as also accepting .38 Special, and many owners shoot both. Some rifles feed the shorter round less smoothly than others. Check the manual and run a few through yours before you buy a case. Our Henry lever-action ammo guide covers this for one popular line.
- Semi-automatic .357 pistols may not cycle reliably with .38 Special, because the lighter load may not produce enough energy to run the action. The manufacturer's manual is the authority here.
The carbon ring problem
Shoot a lot of .38 Special through a .357 revolver and you may notice Magnum rounds getting harder to chamber. The shorter .38 case leaves a small gap at the front of each chamber, and fouling (sometimes lead) builds up there as a ring.
It is not dangerous by itself, but it is annoying, and it can stop a Magnum round from seating fully. The fix is simple: clean the chambers thoroughly after a .38 session, paying attention to the front of each chamber. If you carry Magnum loads, check that each round drops in freely before you holster up.
Which should you buy?
- You own a .38 Special revolver: buy .38 Special. Use +P only if the gun is rated for it.
- You own a .357 and mostly shoot paper: buy .38 Special in bulk for practice and keep a smaller supply of Magnum loads for full-power practice.
- You carry a .357: choose the load you can control, test it in your gun, then practice with something close in recoil and point of impact.
- You hunt or hike with a .357: look at heavier, tougher bullets made for that job, and check your state's hunting rules on cartridges and bullet types.
And keep the two separated in your range bag. They look alike at a glance, and a mixed box is the easiest way to end up with a Magnum round near a .38-only gun. Our dangerous ammo swaps guide covers this and other mix-ups.
One more tip: when you buy a .357 Magnum load for carry or the outdoors, buy a few boxes from the same lot if you can. Shoot one box to confirm point of impact and recoil in your revolver, then keep the rest for carry and rotation. That way you know exactly what to expect from every round in the cylinder.
Frequently asked questions
Can I shoot .38 Special in a .357 Magnum revolver?
Yes. A revolver chambered in .357 Magnum is designed to fire .38 Special as well. Clean the chambers afterward so fouling doesn't make Magnum rounds hard to load.
Can I shoot .357 Magnum in a .38 Special revolver?
No. The Magnum runs at much higher pressure, and its longer case is meant to keep it out of .38-only cylinders. Never try to force it.
Is .38 Special +P the same as .357 Magnum?
No. .38 Special +P has a higher pressure ceiling than standard .38 Special but is still well below the .357 Magnum. It uses the shorter .38 case.
Why is .38 Special cheaper to shoot?
It uses a smaller powder charge, is made in large volumes and is popular for target shooting. Exact pricing varies by load and retailer, so compare cost per round on current listings.
Will .38 Special work in my .357 lever-action rifle?
Many lever guns are listed as accepting both, but feeding can vary by model. Check the owner's manual and try a few rounds before buying in bulk.
Editorial note: This guide draws on SAAMI published specifications, manufacturer information and retailer listings. We haven't tested these loads hands-on. Specifications, availability and prices change, so check the current listing and your firearm's manual before buying. We may earn a commission from links on this page at no extra cost to you.
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