A PVT SMA PLT CLBS INTO THE LOWER FRINGES OF THE MSP CLASS B DURING A NIGHT OP. SAYS THE ACFT 'CLB PERFORMANCE WAS SURPRISINGLY GOOD.'

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ARRIVED AT ST PAUL DOWNTOWN HOLMAN FIELD TO PICK UP 2 PAX FOR A PLEASURE FLT; RETURNING AT DUSK. A FEW HRS LATER; AFTER DARK; I LEFT ALONE WITH ST PAUL TWR CLRNC FOR RWY 32 DEP; R TURN TO E HDG. DURING THIS POST-TKOF GRADUAL R CLBING TURN TO E; MY CLB PERFORMANCE WAS SURPRISINGLY GOOD IN COMPARISON TO THE MAX GROSS WT TKOF EARLIER. I THUS REALIZED IT WAS POSSIBLE I HAD EXCEEDED 2300 FT MSL JUST BEFORE LEAVING THE 80/23 CLASS B MSP RING. I REALIZED I HAD CLBED TO 2700 FT QUICKER THAN EXPECTED; PROBABLY 1-2 NM INTO THE 80/30 RING OF CLASS B; LEVELING OFF THERE. CONTRIBUTING FACTORS TO THIS POSSIBLE ERROR ARE MY RELATIVELY LOW HRS AS PVT PLT; AND THIS BEING MY FIRST CLASS B ENVIRONMENT TRIP. I DO HAVE A SUGGESTION; HOWEVER. WHY NOT PUT A WEDGE-SHAPED 80/30 SHELF OVER ST PAUL HOLMAN AND S-ST PAUL FLEMING ARPTS (SEE DRAWING). I DO NOT PRETEND TO BE AN EXPERT; BUT WOULD THIS ADVERSELY AFFECT TURBOJET OPS? AN ADDED BENEFIT WOULD BE IN ARRS: WHEN I WAS ARRIVING FOR THE FIRST TIME LOOKING FOR THE ARPT; I FOUND THE 2000 FT MSL UNDER THE 80/23 SHELF MADE SEEING THE FIELD DIFFICULT IN THE DENSE METRO AREA. IN SUMMARY; I FOUND THIS POSSIBLE ERROR A USEFUL EXPERIENCE AND A CHEAP LESSON.