BEECH B100 PLT DSNDED BELOW. CIRCLING APCH MINIMUMS DURING AN INSTRUMENT GPS APCH.

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BECAUSE I COULD NOT CONDUCT FLT TRAINING (WX) I WAS ASKED BY THE CAPT IF I WOULD LIKE TO RIDE ALONG. WE WERE IN A BEECH KING AIR B100. AT ABOUT XA15 THE WX AT TDZ WAS RPTED 200 OVC; VIS MISSING; TOL WAS RPTING 100 OVC VIS 2.5 AND RAIN; YIP WAS 3400 BKN 5 MI VIS. THE CAPT OPTED TO TRY THE GPS 4 AT TDZ; HE ASKED THE CTLR IF ANYONE WAS GETTING IN AT TOL 4 THE CTLR REPLIED 'YES; THEY WERE.' AS WE BEGAN THE APCH THE CAPT ASKED ME TO LOOK FOR GND CONTACT AND THE RWY; SO I WAS NOT LOOKING AT THE INSTRUMENTS OR ALTIMETER. I RPTED GND CONTACT AND THEN THE RWY INSIGHT. THE CAPT STATED THAT HE COULD NOT LAND STRAIGHT IN AND THAT HE WOULD HAVE TO CIRCLE TO RWY 22. WHILE ON DOWNWIND FOR RWY 22 THE CAPT SAID HE HAD LOST VISUAL CONTACT AND RPTED GOING MISSED APCH. THEN THE VISIBILITY OPENED UP; THE CAPT SAID HE HAD THE RWY AGAIN. HE TURNED TIGHT AND LANDED ON RWY 22. THE ACFT TOUCHED DOWN 1/3 TO 1/2 WAY DOWN THE RWY AND WAS SLOWED ENOUGH TO TURN AROUND AND BACK TAXI WITH 700 TO 800 FT OF RWY REMAINING. SINCE I WAS NOT WATCHING THE ALTIMETER I DO NOT KNOW IF THE CAPT DSNDED BELOW MINIMUMS. I BELIEVE THAT THE CAPT SHOULD HAVE CONTINUED WITH THE MISSED APCH AFTER HE RPTED 'GOING MISSED.' AFTER TAXIING TO THE RAMP AND SHUTTING DOWN WE WERE MET BY TWO REPRESENTATIVES OF THE FAA WHO INFORMED US THAT THEY WERE GOING TO CONDUCT A RAMP CHECK.