I have a G23 and I bought a fluted Alpha Wolf .357 Sig barrel for it. I have 4 or 5 .40 cal mags and 1 .357 mag. Due to the price of ammo for .357 Sig I don’t shoot it as much as I would like to, but what shooting I’ve done I haven’t experienced any issues with the .40 mags. I have only shot fmj through mine, so I don’t know how HP ammo would perform. Here are some pics of the magazines to compare. In pic #1 they look very similar as you would expect.


In pic #2 you can see the G22 mag’s follower is marked with 10, and the G31 mag is marked 3.


In the 3rd pic you can notice subtle differences, .357 is on the left, .40 on the right.


For defensive use I think it would be wise to use the corresponding mags or followers for optimal reliability. For range use either works from my limited experience.








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