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I believe you'd need to do a barrel, recoil spring and maybe a magazine change to do it. But as is the answer would be no, a .40 S&W round will not chamber in a bottleneck .357 Sig chamber
 

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No the .40 is a larger caliber.
 

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A barrel change would be needed, the recoil spring and mags are the same iirc. The 357 sig is essentially a 9mm in a .40 s&w case
 

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You can use the same magazines but will need to get a barrel for .357 sig. No other changes should have to be made. Your RSA and ejector should work just fine.
 

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Extractor in a chambered 357sig will work on
9mm and 40. +1 on barrel needed, spring for 357sig will
Work on 40,45, and 357sig. 9mm needs lighter spring. Mag for .40 will hold both that and 357 or vise versa.
 
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