Looks like @ 530,000lbs (or 239t) you have 1.33 buffet, from there it goes to 1.39g @ 500,000lbs (or 226t)
What was your GW @ the time?
777-300ER GE90-115BL CONFIG 01 REPORT VERSION = 2.6
UNITS FOR INPUT VARIABLES: UNITS FOR ALTITUDE ARE: FT UNITS FOR RATE OF CLIMB ARE: FPM
------------------------- UNITS FOR WEIGHT ARE: LB UNITS FOR TEMPERATURE ARE: C
ALTITUDE = 37000 FT WIND = 0.0 KT DELTA ISA = +0.0 DEG C OAT = -56.50 DEG C
SPEED OF SOUND = 573.569 KTS DELTA = 0.21379 THETA = 0.75187
INPUT SPEED TYPE = TABLE CRUISE LIMIT POWER SETTING = CRS CRUISE INPUT TEMPERATURE TYPE = DELTA ISA
SPEED SELECTED = LRC VREF INCREMENT VALUE = 0.000 RATE OF CLIMB LIMITS BUFFET LIMIT IS: 1.30
R/C POWER
VMO/MMO CUTOFF OPTION: YES INCLUDE APU FUEL FLOW: NO 300.00 CLB
0.00 NONE
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FUEL MACH IAS EAS GRND AIR FM CL D FN BODY R/C N1-1 N2-1 N3-1 G'S
WEIGHT FLOW TAT CAS TAS SPD GRND FM W/DELTA CD D/DELTA FN/DELTA ANGLE AVAIL N1-2 N2-2 EGT1 TO
LB LB/HR DEG C KTS KTS KTS NAMS/LB LB LBS LBS DEG FPM DEG C BUFF
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560000 * NOT POSSIBLE TO GENERATE VALID DATA FOR THIS POINT BECAUSE BUFFET LIMIT WAS EXCEEDED
FUEL MACH IAS EAS GRND AIR FM CL D FN BODY R/C N1-1 N2-1 N3-1 G'S
WEIGHT FLOW TAT CAS TAS SPD GRND FM W/DELTA CD D/DELTA FN/DELTA ANGLE AVAIL N1-2 N2-2 EGT1 TO
LB LB/HR DEG C KTS KTS KTS NAMS/LB LB LBS LBS DEG FPM DEG C BUFF
------------------------------------------------------------------------------------------------------------------------------------
545000 * NOT POSSIBLE TO GENERATE VALID DATA FOR THIS POINT BECAUSE BUFFET LIMIT WAS EXCEEDED
530000 15201 .8396 274.1 256.8 481.6 0.03168 2479019 0.5155 26529 37403 2.48 1015.9 84.7 1.33
-25.95 274.1 481.6 0.03168 .02580 124085 174949
515000 14799 .8400 274.2 256.9 481.8 0.03255 2408858 0.5005 25818 37403 2.37 1111.0 84.1 1.36
-25.93 274.2 481.8 0.03255 .02509 120759 174948
500000 14452 .8399 274.2 256.9 481.8 0.03334 2338697 0.4859 25193 37403 2.27 1182.7 83.5 1.39
-25.93 274.2 481.8 0.03334 .02448 117838 174948
485000 14128 .8394 274.0 256.7 481.5 0.03408 2268536 0.4719 24613 37403 2.17 1238.4 83.0 1.43
-25.97 274.0 481.5 0.03408 .02395 115125 174949
470000 13802 .8381 273.5 256.3 480.7 0.03483 2198375 0.4588 24035 37404 2.09 1289.0 82.5 1.47
-26.07 273.5 480.7 0.03483 .02346 112422 174951
455000 13470 .8353 272.5 255.5 479.1 0.03557 2128214 0.4471 23452 37405 2.03 1326.5 81.9 1.51
-26.27 272.5 479.1 0.03557 .02305 109697 174956
440000 13130 .8309 270.9 254.1 476.6 0.03629 2058053 0.4370 22862 37406 1.99 1343.9 81.2 1.56
-26.59 270.9 476.6 0.03629 .02271 106936 174963
425000 12759 .8245 268.5 252.2 472.9 0.03706 1987892 0.4287 22238 37408 1.98 1377.9 80.5 1.62
-27.05 268.5 472.9 0.03706 .02243 104017 174974
410000 12349 .8162 265.5 249.6 468.1 0.03791 1917731 0.4220 21569 37411 1.99 1422.0 79.8 1.68
-27.64 265.5 468.1 0.03791 .02220 100888 174987
400000 12056 .8098 263.2 247.7 464.5 0.03853 1870957 0.4182 21095 37414 2.00 1471.6 79.3 1.72
-28.09 263.2 464.5 0.03853 .02206 98670 174998
CRUISE PERFORMANCE TAB OUTPUT