.357 SIG vs .40 S&W: Is the Bottleneck Worth It?
May 31, 2026 · AmmoBin.com
.357 SIG was created to replicate the legendary .357 Magnum in a semi-auto — it's a bottlenecked .40 S&W case necked to 9mm. Here's how it compares to its parent.
Velocity and recoil
.357 SIG drives a lighter bullet very fast, giving flat trajectory, snappy recoil, and a loud report. .40 S&W uses a heavier, slower bullet with a more 'pushy' recoil. Both share the same parent case head, so capacity is similar.
Cost and availability
.40 S&W is far cheaper and more available; .357 SIG is a niche round that costs more and is harder to find. That's the main reason .40 (and 9mm) overtook it.
Pick .357 SIG for high velocity and a specific platform; .40 S&W for value and availability — or see why many chose .40 vs 9mm. Compare live prices for .357 SIG and .40 S&W.
Frequently asked questions
Is .357 SIG worth it over .40 S&W?
It offers high velocity and flat trajectory but at higher cost and lower availability. .40 S&W is cheaper and easier to find for similar defensive performance.
Is .357 SIG the same as .357 Magnum?
No — .357 SIG is a semi-auto bottleneck cartridge designed to mimic .357 Magnum ballistics; .357 Magnum is a revolver cartridge.
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