T210 PLT INADVERTENTLY ENTERS P49 TFR WHILE TRANSITING VFR TO LXY.

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I FLEW FROM THE HILL COUNTRY (TA52) TO HORSESHOE BAY (4X57) TO VISIT FAMILY AND DRIVE TO AUSTIN ON BUSINESS. DEPARTED 4X57 FOR LXY AT APPROX XA30; VFR NIGHT FLT. AFTER REACHING CRUISING ALT OF 5500 FT; I CHANGED FREQ FROM 122.8 TO 118.8 TO MONITOR AUSTIN APCH. MY WIFE; A PLT ALSO; AND I WERE DISCUSSING THE DAY'S EVENTS. IT WAS A VERY CLR NIGHT. WE BOTH HAD TRAVELED THIS RTE 2-6 TIMES A MONTH FOR YRS AND ARE VERY FAMILIAR WITH P49 RESTRS ALONG THIS RTE. I GET A BRIEFING PRIOR TO EVERY FLT FROM A COMMERCIAL WEB SITE AND/OR FSS AS TO THE EXPANSION OF P49. I WAS AWARE OF THE 30 MI ZONE. I WAS FLYING 053 DEGS FROM RX57 TO LXY AND NORMALLY FLY OVER TEMPLE WITH THE ARPT AND LAKES ON MY L SIDE. ABOUT TEMPLE; I SWITCHED FROM 118.8 TO 135.2 AND A FEW MINS LATER; WACO CALLED FOR ACFT E OF TEMPLE AT 5500 FT TO CONTACT WACO APCH ON 135.2. I RESPONDED IMMEDIATELY WITH MY POS AND HE GAVE ME A SQUAWK CODE. I ALSO HAD BEEN MONITORING WACO APCH AND HEARD HIM TALK TO A HELI THAT WAS FLYING IN THE RESTR AREA AND HE WAS TOLD TO CALL GRAY APCH ONCE ON THE GND. THE WACO CTLR LATER CAME BACK TO ME AND TOLD ME TO CONTACT GRAY APCH CTLR ONCE I WAS ON THE GND. AFTER LNDG LXY ABOUT 40 MINS LATER; I CONTACTED THE CTLR. HE STATED I HAD FLOWN THROUGH THE EDGE OF THE RESTR AREA APPROX 1.5 - 2 MI. HE TOOK DOWN SOME INFO AND SAID THAT IS ALL HE NEEDED FOR HIS RPT. IN THE FUTURE; I SHOULD HAVE CONTACTED GRAY APCH CTL SOONER AND WILL DO THAT WHEN I AM CLOSE TO THE P49 RESTR AREA; EVEN THOUGH I THOUGHT I WAS OUTSIDE OF THE RESTR AREA. I REALIZE I MADE A BAD DECISION FOR NOT GETTING FLT FOLLOWING WHICH I DO 99% OF THE TIME UNLESS I'M FLYING LOCAL AND WILL NOT LET THIS HAPPEN AGAIN IN THE FUTURE. I TREASURE MY FLYING PRIVILEGE. I HAVE LEARNED MY LESSON HERE.