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pblanc · February 12, 2019, 04:34 PM

The faster 357 SIG will shoot to a lower point of impact than .40 S&W will using the same sights and the same hold (sight picture). That is because the projectile clears the barrel sooner so that recoil has had less opportunity to cause muzzle rise.

The change in POI may depend a bit on barrel length and will vary a bit with different loads producing varying muzzle velocities. The faster projectile will shoot flatter, however, so at some point the POI for the 357 SIG will be higher than that for the slower .40 S&W, but you will probably have to shoot at ranges well beyond 25 yards to see that.

I shoot .40 S&W and 357 SIG out of two different SIG P229 pistols. I shoot a lot more .40 S&W than 357 SIG. One pistol is sighted for what SIG feels is appropriate for .40 S&W and one has sights for 357 SIG. I just adjust hold as necessary.

February 12, 2019, 04:34 PM	#3
pblanc Senior Member Join Date: March 23, 2008 Location: Indiana Posts: 697	The faster 357 SIG will shoot to a lower point of impact than .40 S&W will using the same sights and the same hold (sight picture). That is because the projectile clears the barrel sooner so that recoil has had less opportunity to cause muzzle rise. The change in POI may depend a bit on barrel length and will vary a bit with different loads producing varying muzzle velocities. The faster projectile will shoot flatter, however, so at some point the POI for the 357 SIG will be higher than that for the slower .40 S&W, but you will probably have to shoot at ranges well beyond 25 yards to see that. I shoot .40 S&W and 357 SIG out of two different SIG P229 pistols. I shoot a lot more .40 S&W than 357 SIG. One pistol is sighted for what SIG feels is appropriate for .40 S&W and one has sights for 357 SIG. I just adjust hold as necessary.