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Hi Andrew, the 357Sig is based off of the 40S&W case (40 necked down to 9mm)(The Magazines are the same between 357Sig & 40). I would call Buds/Sig on the Wilson Combat magazine seating issue to see if normal. Sig Customer Service : 603-610-3000 option 1 or Buds (859) 368-0371 (available 9AM to 9PM EST Monday through Friday). ****Note - All my 357Sig pistol magazines are marked 357Sig*****
James G.
8 years ago