NMAC OCCURS NW OF BCB BETWEEN C177 DEPARTING RWY 30 AND C172 MAKING PRACTICE IAP TO RWY 12.

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NMAC WAS BROUGHT ABOUT BY MY ACFT DEPARTING AND CLBING OUT FROM RWY 30 WHILE ANOTHER ACFT WAS PRACTICING AN IFR APCH PROC LOC/DME FOR RWY 12 APPROX 3 NM WNW OF THE ARPT DIRECTLY IN-LINE WITH THE RWY AT BCB. CONDITIONS AT THE TIME WERE 20 MI VISIBILITY WITH SOME HAZE; BUT OTHERWISE NO CLOUDS AND UNRESTR VISIBILITY WITH LIGHT WINDS FROM 270 DEGS AT 4 KTS. PRIOR TO DEPARTING FROM RWY 30 AT BCB; I NOTED AN ACFT CALLING FOR A PRACTICE LOC APCH TO RWY 12 AT 10 MI TO THE NW. UPON DEPARTING AND CLBOUT FROM RWY 30; I CONTINUED MONITORING UNICOM 123.05; THE OTHER PLT WAS THEN RPTING 5 MI NW AND SO I BEGAN SEARCHING FOR THIS ACFT SLIGHTLY TO MY L AT ABOUT AN 11:30 O'CLOCK POS. A FEW MINS LATER AFTER FAILING TO LOCATE THE OTHER ACFT; I INITIATED A SHALLOW R BANK. AT THAT MOMENT THE SECOND ACFT WAS DIRECTLY AHEAD DSNDING TOWARD ME AND CLOSE ABOARD SO I RAPIDLY INCREASED R BANK TO 60+ DEGS TO AVOID ANY POSSIBILITY OF A COLLISION. MY FLT CONTINUED ON TO THE N WITHOUT INCIDENT. THE OTHER PLT APPARENTLY DID NOT SEE MY ACFT AT ANY TIME AS THERE WAS NO CHANGE IN HIS RPTING COMS (VOICE TIMBRE). I FELT THAT I SHOULD NOT TAKE UP THE FREQ WITH A RPT (AFTER NEAR MIDAIR) TO THE SECOND PLT AS HE WAS STILL MAKING POS RPTS AND THERE MAY HAVE BEEN OTHER ACFT DEPARTING OR WAITING TO DEPART RWY 30. NEGATIVE CONTRIBUTING FACTORS INCLUDE: 1) A HIGH GROSS WT OF MY ACFT WITH 2 PAX AND FULL FUEL SLOWING THE CLBOUT. 2) THE TERRAIN N OF THE ARPT DELAYING MY TURN DUE N AS PLANNED. 3) LACK OF APPRECIATION FOR HEAD ON CLOSING SPDS ABOVE 160 KTS AND UNKNOWN SECOND ACFT TYPE/CAPABILITY. 4) NO COMS WITH SECOND PLT AFTER CALLING OUT A DEP FROM RWY 30 WITH AN EXPECTED DEP FROM THE PATTERN TO THE N. 5) HIGH AMOUNT OF RADIO COMS TFC ON FREQ DUE TO LARGE NUMBER OF PLTS ENJOYING EXCELLENT FLYING CONDITIONS. 6) IFR PRACTICE FLTS IN DIRECT OPPOSITION TO FREQUENT VFR DEPS. POSITIVE CONTRIBUTING FACTORS INCLUDE: 1) PROPER POS RPTING BY SECOND PLT. 2) EXCELLENT WX. 3) INTENSIVE VISUAL SEARCH FOR SECOND ACFT DUE TO EXPECTED POS AND TURN AWAY TO REMOVE ANY VISUAL OBSTRUCTIONS FROM LOCATING THE OTHER ACFT.