.357 SIG vs .40 in Glock

This is a discussion on .357 SIG vs .40 in Glock within the Defensive Ammunition & Ballistics forums, part of the Defensive Carry Discussions category; Newbie from Oregon - I apologize if this thread has been beaten to death - which is the better combat round in Glock 33 - ...

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Thread: .357 SIG vs .40 in Glock

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    New Member Array Xpartan's Avatar
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    .357 SIG vs .40 in Glock

    Newbie from Oregon - I apologize if this thread has been beaten to death - which is the better combat round in Glock 33 - .357 SIG or rebarrel to .40?

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    VIP Member Array pogo2's Avatar
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    Similar ballistics with lightweight .40 ammo

    If you already have a Glock 33 with the .357 Sig barrel, it will cost you about $120 to buy a second barrel in .40 caliber. I consider the effectiveness of these two calibers to be roughly equivalent, especially if you buy lightweight .40 ammo in the 135 grain weight, which gives almost the same velocity and energy as typical .357 Sig ammo.

    So I guess if I already had the .357 Sig I might not bother to buy the .40 barrel. And vice versa. I believe .40 practice ammo is somewhat cheaper than .357 Sig practice ammo, however, so if I didn't own either gun I might tend to go with the .40 as my gun purchase.

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    New Member Array Xpartan's Avatar
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    Thanks for that - I already own in .357 SIG so I'll take your advice and stay with it. I reload on a Dillon so practice ammo is reasonable.

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    Senior Member Array jualdeaux's Avatar
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    The .357sig uses a lighter bullet that travels faster. The .40 uses a heavier bullet that goes a bit slower. Both, I believe, end up with around the same energy on target. Both rounds recoil have a distinct snappiness to them that some might not like. The .357sig was just a touch more to me. In the end it comes down to ammo cost and availability. You can get cheap, well relatively cheap, .40 anywhere. That isn't the case with .357sig. But, since you reload, you might be able to get around this.

    Due to everything being the same as far as the internals of the Glock 27 and 33 except for the barrel, you might want to get the 27 barrel just to check out and have fun with anyway.

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