125gr 357sig vs. 125gr 357 magnum?

This is a discussion on 125gr 357sig vs. 125gr 357 magnum? within the Defensive Ammunition & Ballistics forums, part of the Defensive Carry Discussions category; Is it true that the 125gr 357sig round offers the same performance as the 125gr 357 magnum round,when both are fired from a 4" barrel? ...

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Thread: 125gr 357sig vs. 125gr 357 magnum?

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    Senior Member Array 1911luver's Avatar
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    125gr 357sig vs. 125gr 357 magnum?

    Is it true that the 125gr 357sig round offers the same performance as the 125gr 357 magnum round,when both are fired from a 4" barrel?

    I've read that the 357sig was developed specifically for this purpose,but does it measure up in real world use? Does it really offer "magnum performance in an auto pistol"?
    Snub nose revolvers,the original concealed carry guns.

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    The .357Sig loaded with a 125Gr Bullet will go at 1500 FPS and have 619Ft. Lbs of energy.
    The .357 Magnum loaded with a 125Gr Bullet is 1600 FPS and have 710Ft. Lbs of energy.
    Not much difference except it is harder to get Social Ammo for the .357Sig these days and the bullet is a 9MM (.355) and the .357Magnum is .357 diameter.
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    At "social encounter" distances, the 91 foot-pounds of difference in energy will make very little practical difference in the outcome.

    Does it really offer "magnum performance in an auto pistol"?
    I just looked at data for .357 mag, .357 Sig and 10mm from Federal, Hornady and Winchester. In the JHP loadings closest to 125 grains, in muzzle energy alone the .357 is tops for Fed and Hornady. In the Winchester line, the 10mm auto shows 10% higher ME than the .357 mag. .357 Sig is at the bottom of the three in the Hornady and Win loadings. Realistically, not a huge difference among the three with respect to external ballistics.
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    Senior Member Array Keltyke's Avatar
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    If I carried a .357 mag., I'd use all that power to throw a heavier bullet than a 125.

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    Quote Originally Posted by Keltyke View Post
    If I carried a .357 mag., I'd use all that power to throw a heavier bullet than a 125.
    The 158 grain JHP and soft-point loads were found to over-penetrate humans... the 125 gr JHPs are probably the best stopper out there.

    But if you need to shoot through tough barriers like sheet metal, I'd sure give the nod to the heavies.
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    The 145gr Silvertips have found favor with a number of people.

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    Take a look here for information: Pete's .357 Sig.
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    Quote Originally Posted by Blue Thunder View Post
    The .357 Magnum loaded with a 125Gr Bullet is 1600 FPS and have 710Ft. Lbs of energy.
    I have seen most of the factory loaded 125 gr ammo is between 1200 and 1500 FPS, except for Buffalo Bore which is 1700 FPS and Double Tap at 1600 FPS. Speer Gold Dots is 1450 FPS is the velocity that the .357 Sig was suppose to mirror.
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    Sticking with 125 grn bullets, the difference in power is so slight no BG will know the difference. The actual velocities of either probably aren't going to match "advertised" specs due to different barrels used and other conditions. Use them only as a basic guideline, not gospel.

    The advantage with the .357 SIG round is the increase in capacity. If you want to change bullet weights, then the comparisons fall through.

    I think that those who claim the SIG ammo isn't available simply aren't looking. It's there. The choices in bullets is limited though. Prices are comparable in both calibers.

    Wouldn't it have been great if the .357 SIG actually used a .357 bullet? Think of the reloading possibilities available then. There's a wildcat round begging for testing.
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