Drop down to the speed of 3110 on this chart and quick load thinks your guess of about 63k is spot on:

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 Cartridge          : .30-06 Spring.  (CIP)
Bullet             : .308, 150, Nosler BalTip 30150
Cartridge O.A.L. L6: 3.340 inch or 84.84 mm
Barrel Length      : 24.0 inch or 609.6 mm
Powder             : Hodgdon H4350

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-10.0   99    54.90   2824    2655   45576   9072     94.8    1.200
-09.0  100    55.51   2857    2719   47233   9175     95.3    1.181
-08.0  101    56.12   2890    2783   48961   9275     95.8    1.162
-07.0  103    56.73   2924    2847   50757   9370     96.2    1.143  ! Near Maximum !
-06.0  104    57.34   2957    2913   52628   9462     96.7    1.124  ! Near Maximum !
-05.0  105    57.95   2991    2979   54576   9549     97.1    1.106  ! Near Maximum !
-04.0  106    58.56   3024    3046   56605   9631     97.5    1.089  ! Near Maximum !
-03.0  107    59.17   3058    3114   58725   9710     97.9    1.071  !DANGEROUS LOAD-DO NOT USE!
-02.0  108    59.78   3091    3183   60933   9783     98.2    1.054  !DANGEROUS LOAD-DO NOT USE!
-01.0  109    60.39   3125    3252   63238   9851     98.5    1.037  !DANGEROUS LOAD-DO NOT USE!
+00.0  110    61.00   3158    3322   65643   9915     98.8    1.020  !DANGEROUS LOAD-DO NOT USE!
+01.0  111    61.61   3192    3393   68156   9973     99.0    1.004  !DANGEROUS LOAD-DO NOT USE!
+02.0  112    62.22   3225    3464   70783  10026     99.3    0.988  !DANGEROUS LOAD-DO NOT USE!
+03.0  114    62.83   3258    3536   73530  10073     99.5    0.972  !DANGEROUS LOAD-DO NOT USE!
+04.0  115    63.44   3292    3609   76403  10115     99.6    0.957  !DANGEROUS LOAD-DO NOT USE!
+05.0  116    64.05   3325    3682   79414  10150     99.8    0.941  !DANGEROUS LOAD-DO NOT USE!

Results caused by � 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba    110    61.00   3304    3635   79534   9592    100.0    0.946  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    110    61.00   2955    2909   53440   9676     92.9    1.117  ! Near Maximum !