BEECH BARON PLT HAD THE NOSE GEAR COLLAPSE ON LNDG AT BPK.

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ALTHOUGH THIS OCCURRENCE IS NOT CONSIDERED AN 'ACFT' ACCIDENT UNDER NTSB PART 830; I AM RPTING THIS OCCURRENCE FOR SAFETY REASONS. AT APPROX XA45 HRS CENTRAL TIME ON SEP/XY/99; I WAS LNDG AT MOUNTAIN HOME; AK; BPK RWY 5. I CROSSED OVER MID-FIELD AT AN APPROX 45 DEG ANGLE; WENT DOWNWIND FOR RWY 5; TURNED BASE; EXTENDED THE LNDG GEAR AND HAD A POSITIVE OF 3 GREEN LIGHTS ON THE BASE LEG AND AT APPROX 600 FT AGL; I EXTENDED FULL FLAPS AND CROSSED OVER THE NUMBERS AT 85 KTS TO 90 KTS AND MADE WHAT WOULD HAVE BEEN A NORMAL TOUCHDOWN; MAIN WHEELS FIRST; LNDG AT MOUNTAIN HOME. UPON LNDG; AT THE POINT THAT THE NOSEWHEEL WOULD HAVE TOUCHED DOWN; THE ACFT JUMPED UPWARDS. I HELD FIRM ON THE YOKE; THE ACFT JUMPED UPWARDS THE SECOND TIME AND I APPLIED FULL PWR FOR GAR BUT DID NOT HAVE ANY ACCELERATION AFTER APPLYING FULL PWR. AT THAT POINT AND TIME I REALIZED THAT THE PROPS WERE STRIKING THE RWY AND I KEPT THE ACFT STRAIGHT AND BEGAN TO THINK THROUGH EMER ACTION PROCS. THE ACFT PROCEEDED DOWN THE RWY IN A STRAIGHT-LINE FASHION WITH PROPS TURNING AND HITTING FOR PERHAPS 2000 MORE FT. SINCE THERE WAS STILL ADEQUATE FORWARD SPD; I USED THE BRAKES TO GUIDE THE ACFT OFF OF THE ACTIVE RWY ONTO A CONNECTING TXWY. AFTER STOPPING; I IMMEDIATELY OPENED THE DOOR AND URGED THE 3 PAX ONBOARD TO IMMEDIATELY EXIT THE ACFT. I SHUT THE ENGS DOWN; TURNED OFF THE ALTERNATORS; TURNED OFF THE MAGNETOS; TURNED OFF THE MAIN PWR AND TURNED OFF THE FUEL; AND EXITED THE ACFT. UPON EXITING THE ACFT AND VERIFYING THAT ALL PAX WERE OKAY; I DETERMINED THAT THE NOSEWHEEL AND THE CONNECTING AXLE OF THE NOSE GEAR WERE NOT ON THE ACFT AND HAD APPARENTLY BROKEN OFF. BOTH PROPS WERE BENT FROM PROP STRIKES.