Easy Peasy.

You just need a case full of RL-17 and a 30" barrel.
If you don't have a 30" barrel, don't even try:
Code
Cartridge          : .375 H.& H. Mag.
Bullet             : .375, 260, Nosler AccuBond 54413
Useable Case Capaci: 77.767 grain H2O = 5.049 cm³
Cartridge O.A.L. L6: 3.600 inch = 91.44 mm
Barrel Length      : 30.0 inch = 762.0 mm
Powder             : Alliant Reloder-17 *T

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.625% 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

-06.3  100    75.00   2862    4729   51334   6789    100.0    1.373
-05.6  100    75.50   2880    4789   52487   6804    100.0    1.360
-05.0  101    76.00   2898    4849   53670   6818    100.0    1.348  ! Near Maximum !
-04.4  102    76.50   2916    4909   54882   6832    100.0    1.335  ! Near Maximum !
-03.8  102    77.00   2934    4969   56127   6845    100.0    1.322  ! Near Maximum !
-03.1  103    77.50   2952    5030   57402   6858    100.0    1.310  ! Near Maximum !
-02.5  104    78.00   2969    5091   58710   6871    100.0    1.298  ! Near Maximum !
-01.9  104    78.50   2987    5152   60051   6883    100.0    1.286  ! Near Maximum !
-01.3  105    79.00   3005    5213   61430   6895    100.0    1.274  ! Near Maximum !
-00.6  106    79.50   3023    5274   62846   6907    100.0    1.262  !DANGEROUS LOAD-DO NOT USE!
+00.0  106    80.00   3040    5336   64295   6919    100.0    1.250  !DANGEROUS LOAD-DO NOT USE!
+00.6  107    80.50   3058    5397   65788   6930    100.0    1.239  !DANGEROUS LOAD-DO NOT USE!
+01.3  108    81.00   3075    5459   67319   6941    100.0    1.227  !DANGEROUS LOAD-DO NOT USE!
+01.9  108    81.50   3093    5521   68891   6952    100.0    1.216  !DANGEROUS LOAD-DO NOT USE!
+02.5  109    82.00   3110    5584   70501   6963    100.0    1.205  !DANGEROUS LOAD-DO NOT USE!
+03.1  110    82.50   3127    5646   72167   6973    100.0    1.194  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 3% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 3% relative to nominal value:
+Ba    106    80.00   3076    5463   68353   6807    100.0    1.222  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 3% relative to nominal value:
-Ba    106    80.00   2999    5191   60413   7046    100.0    1.281  ! Near Maximum !


You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.

You cannot over estimate the unimportance of nearly everything. John Maxwell