ALTDEV ALT OVERSHOT -- WRONG ALTIMETER SETTING.

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DSCNT CLRED TO 3000 FT -- MY ALTIMETERS WERE SET ON 30.32. I LISTENED TO ATIS. LOTS OF INTERFERENCE WITH ZBW ON CYMX ATIS. FO LATER LISTENED TO ATIS; ALTIMETER WAS 29.32. HE SET HIS ALT TO 29.32 -- DID NOT CHK MINE. AUTOPLT ALT WINDOW SET 3000 FT (ASSIGNED) FO USED FLT LEVEL CHANGE MODE FOR DSCNT. ACFT LEVELED 3000 FT -- ATC ADVISED US THAT WE WERE AT 2000 FT AND RECLRED US AT 2000 FT. I IMMEDIATELY CHKED THE ALTIMETERS AND WE WERE 1000 FT LOW. EVEN THOUGH STANDARD CALLS WERE USED ON DSCNT (SUCH AS 4 FOR 3) FO FLEW THROUGH ASSIGNED ALT ON HIS ALTIMETER. (AUTOPLT WORKS OFF CAPT'S ALTIMETER). ADDITIONAL INFO -- WX WAS SUCH THAT A 29.32 ALTIMETER WAS NOT EXPECTED -- WINDS WERE CALM AND A CLRING TREND WAS IN THE WORKS. ZBW INTERFERES WITH CYMX ATIS UNTIL LESS THAN 100 MI FROM THE ARPT. 2 MAN CREW -- I WAS OFF THE RADIO (ATC) TALKING TO COMPANY WHEN DSCNT CLRNC WAS GIVEN AND A NEW (OR THE ) ALTIMETER SETTING WAS GIVEN TO THE FO. SUPPLEMENTAL INFO FROM ACN 295347: CAPT IS A STRONG NEVER MAKES MISTAKES GUY BUT LACKS GOOD COPLT MIND SET. IN CREW RESOURCE HE IS VERY AUTHORITARIAN. LIKE FLYING WITH YOUR FATHER. I DO NOT REMEMBER HEARING ALTIMETER ISSUED FROM MONTREAL. ATIS IS FRENCH AND ENGLISH (NOT GREAT ENG). BOEING 757 LEVELS AT ALTIMETER SET IN CAPT'S TOP ALTIMETER. POSSIBLE AUTOPLT OVER CONFIDENCE.