PILOT AND PAX ABOARD BE76 UNKNOWINGLY EXPERIENCE PROP STRIKE ON TAXI OUT. DISCOVER DAMAGE TO PROP ON ARRIVAL AT DESTINATION.

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I WAS INVOLVED IN A TAXI OCCURRENCE; WHICH RESULTED FROM THE OWNER OF THE ACFT DEPARTING THE TXWY DURING INITIAL TAXI FOR DEP; WHICH THEN RESULTED IN THE R PROP BRIEFLY CONTRACTING THE TXWY. THE OWNER (NOT MYSELF) WAS FLYING L SEAT AS THE SOLE MANIPULATOR OF THE FLT CTLS (WHICH HE HAD BEEN FOR THE PREVIOUS 2 FLTS OF THE DAY) WHEN THE CONTACT OCCURRED. I WAS OCCUPYING THE R SEAT. IT'S MY BELIEF THAT HE THOUGHT HE COULD TAXI INTO THE ADJACENT GRASS IN ORDER TO 'TURN THE AIRPLANE INTO THE WIND' FOR THE RUN-UP. IN DOING SO; THE L MAIN TIRE SUNK INTO THE MUD; AND BEFORE ANY CORRECTION COULD BE APPLIED; THE R PROP CONTACTED THE HARD-SURFACED TXWY. NEITHER HE; NOR I REALIZED THE PROP HAD CONTACTED THE SURFACE UNTIL SHUTDOWN REVEALED THE DAMAGE TO THE TIPS. THE RUN-UP SHOWED NO SIGNS OF ENG DAMAGE; NOR WAS ANY VIBRATION DETECTED. PROP CYCLES PROVED TO BE CONSISTENT WITH NORMAL OP; AND THE FEATHER CHK FOR BOTH PROPS ALSO PROVED TO BE OPERATIONAL. THE DECISION WAS THEN MADE TO FLY THE AIRPLANE BACK TO OUR ORIGINAL DEP POINT WITH A POSSIBLY UNAIRWORTHY ACFT. HOWEVER; THE FLT HOME WAS PERFECTLY NORMAL WITH NO INDICATIONS OF PROBS RESULTING FROM THE STRIKE. BOTH ENGS RAN NORMAL WITHIN THEIR OPERATING LIMITATIONS FOR THE ENTIRE FLT.