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Guide

357 SIG Ammo Guide

By , EditorUpdated How we verifyEditorial standards

We load-checked four factory 357 SIG loads on Hornady's and Federal's own product pages on November 5, 2026: two from Hornady and two from Federal. Muzzle, 50-yard and 100-yard velocity and energy below are copied from those maker pages. We don't list prices or use retailer ballistics. All four makers' figures were printed with a 4 in test barrel.

Factory loads we checked

MakerItemLoadgrMuzzle fps / ft-lb50 yd fps / ft-lb100 yd fps / ft-lbSource
Hornady9131357 Sig 147 gr XTP1471,225 fps / 490 ft-lb1,132 fps / 418 ft-lb1,060 fps / 367 ft-lbHornady page
Hornady91296357 Sig 135 gr FlexLock Critical Duty1351,225 fps / 450 ft-lb1,112 fps / 371 ft-lb1,031 fps / 319 ft-lbHornady page
FederalAE357S2American Eagle Handgun 357 Sig 125 gr FMJ1251,350 fps / 506 ft-lb1,192 fps / 395 ft-lb1,078 fps / 323 ft-lbFederal page
FederalP357SHST1SPersonal Defense HST 357 Sig 125 gr HST JHP1251,360 fps / 513 ft-lb1,200 fps / 400 ft-lb1,083 fps / 326 ft-lbFederal page

All four loads were printed with a 4 in test barrel. We did not find Remington or Winchester 357 SIG loads in the maker catalog scans, so they are not checked here. Federal P357SA, P357SHC1 and P357HST1S are .357 Magnum loads, not 357 SIG, and are left out. Bullet weights differ between rows, so the table only shows the printed numbers. Checked November 5, 2026.

SAAMI pressure

SAAMI lists a maximum average pressure (MAP) of 40,000 psi for 357 Sig, measured by transducer (printed as 400 psi/100), in ANSI/SAAMI Z299.3-2022 (SAAMI PDF). Its velocity row is 124/125 gr at 1,350 fps; crusher is N/E. The SAAMI test barrel is 4.000 in (101.60 mm), ±.010 in, per the 357 SIG TEST BARREL drawing (p.152, Z299.3). See every cartridge on the SAAMI MAP pressure chart.

Barrel length

Muzzle velocity changes with barrel length. See the .357 SIG barrel length data for the figures on our own page.

.357 SIG is not the same cartridge as .357 Magnum. For the revolver round, see the .357 Magnum ammo guide. For other duty and carry pistol rounds, see the 9mm ammo guide and the .40 S&W ammo guide. Also see the SAAMI MAP chart, .357 SIG barrel length data and all ammo releases.

Frequently asked questions

What is the SAAMI MAP for 357 SIG?
40,000 psi by transducer (printed as 400 psi/100) in ANSI/SAAMI Z299.3-2022.
Which load in this guide has the fastest muzzle velocity?
Federal Personal Defense HST P357SHST1S, 125 gr HST JHP, at 1,360 fps from a 4 in test barrel, per Federal's page checked Nov. 5, 2026.
Is 357 SIG the same as 357 Magnum?
No. They are different cartridges. Federal P357SA, P357SHC1 and P357HST1S are 357 Magnum loads and are not in this guide.
Are Remington and Winchester 357 SIG loads in this guide?
No. We did not find them in the maker catalog scans, so they are not checked this round.

Sources

  1. Hornady: 357 Sig 147 gr XTP, item 9131 (checked Nov. 5, 2026)
  2. Hornady: 357 Sig 135 gr FlexLock Critical Duty, item 91296 (checked Nov. 5, 2026)
  3. Federal: American Eagle Handgun 357 Sig 125 gr FMJ, item AE357S2 (checked Nov. 5, 2026)
  4. Federal: Personal Defense HST 357 Sig 125 gr HST JHP, item P357SHST1S (checked Nov. 5, 2026)
  5. SAAMI: ANSI/SAAMI Z299.3-2022 Centerfire Pistol and Revolver (357 Sig velocity and pressure data)

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