The Sig Pro is available in 9mm (SP 2009), .40 Auto (SP 2340), and .357 Sig (SP 2340). Only the SP 2340 can change between .40 Auto and .357 Sig with a mere barrel swap—the same magazine is used for both .40 Auto and .357 Sig. Here is a photo of both sides of an SP 2340 10-round magazine:
Note how the left side of the magazine has both calibers stamped on its body.
The SP 2022 is available in all three calibers, and uses the same magazines as the equivalent SP 2009 or SP 2340. In other words, the 9mm SP 2022 uses SP 2009 magazines, and the .40 Auto and .357 Sig SP 2022 use SP 2340 magazines.
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