QL help with 375 H&H 300gr tsx

Bearcat 7000

Beginner
Mar 18, 2018
29
0
I want to use RL 17 with my 375 H&H, my bud shared some data he has. But is not sure of pressures. His load was 82.0 grs with RL17, anyone out their reading this please don't go out running and use this data. He said it shot fine and very accurate load. So if anyone could help me out I really appreciate it. Will be using r-p brass, 300gr tsx maybe 300 AccuBond, fed 215 out of a model 70 with a 24 inch barrel. But if pressures are off the charts will go another route.
 

DrMike

Ballistician
Nov 8, 2006
35,456
2,218
I'd believe 72 grains of RL17 with the 300 grain TSX.

Code:
Cartridge          : .375 H.& H. Mag.
Bullet             : .375, 300, Barnes 'TSX' 30491
Useable Case Capaci: 74.300 grain H2O = 4.824 cm³
Cartridge O.A.L. L6: 3.600 inch = 91.44 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-17

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   91    65.52   2396    3823   43983   8062     99.4    1.373
-09.0   92    66.25   2421    3904   45408   8124     99.6    1.354
-08.0   93    66.98   2446    3986   46883   8181     99.7    1.336
-07.0   94    67.70   2471    4068   48413   8234     99.8    1.318
-06.0   95    68.43   2496    4150   49997   8283     99.9    1.300
-05.0   96    69.16   2521    4234   51641   8327    100.0    1.282
-04.0   97    69.89   2546    4318   53344   8368    100.0    1.265  ! Near Maximum !
-03.0   98    70.62   2571    4402   55109   8404    100.0    1.247  ! Near Maximum !
-02.0   99    71.34   2595    4487   56944   8439    100.0    1.229  ! Near Maximum !
-01.0  100    72.07   2620    4572   58847   8473    100.0    1.211  ! Near Maximum !
+00.0  101    72.80   2644    4657   60821   8506    100.0    1.194  ! Near Maximum !
+01.0  102    73.53   2669    4744   62876   8539    100.0    1.177  !DANGEROUS LOAD-DO NOT USE!
+02.0  103    74.26   2693    4830   65010   8571    100.0    1.160  !DANGEROUS LOAD-DO NOT USE!
+03.0  104    74.98   2717    4917   67227   8602    100.0    1.143  !DANGEROUS LOAD-DO NOT USE!
+04.0  105    75.71   2741    5005   69534   8632    100.0    1.127  !DANGEROUS LOAD-DO NOT USE!
+05.0  106    76.44   2765    5093   71929   8662    100.0    1.111  !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    101    72.80   2739    4998   73864   8131    100.0    1.111  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    101    72.80   2497    4154   49557   8801     98.1    1.300

You'd have a hard time stuffing 82 grains in that case. Case fill is over 114%. Pressure is, as you suspected, off the chart. I doubt that he actually shot that load. Brass fails at ~85K psi.

Code:
Cartridge          : .375 H.& H. Mag.
Bullet             : .375, 300, Barnes 'TSX' 30491
Useable Case Capaci: 74.300 grain H2O = 4.824 cm³
Cartridge O.A.L. L6: 3.600 inch = 91.44 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-17

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  103    73.80   2678    4776   63664   8551    100.0    1.170  !DANGEROUS LOAD-DO NOT USE!
-09.0  104    74.62   2705    4874   66107   8587    100.0    1.151  !DANGEROUS LOAD-DO NOT USE!
-08.0  105    75.44   2732    4972   68661   8621    100.0    1.133  !DANGEROUS LOAD-DO NOT USE!
-07.0  106    76.26   2759    5071   71329   8655    100.0    1.115  !DANGEROUS LOAD-DO NOT USE!
-06.0  107    77.08   2786    5171   74123   8687    100.0    1.097  !DANGEROUS LOAD-DO NOT USE!
-05.0  108    77.90   2813    5272   77045   8718    100.0    1.080  !DANGEROUS LOAD-DO NOT USE!
-04.0  110    78.72   2840    5374   80104   8749    100.0    1.063  !DANGEROUS LOAD-DO NOT USE!
-03.0  111    79.54   2867    5476   83312   8778    100.0    1.046  !DANGEROUS LOAD-DO NOT USE!
-02.0  112    80.36   2894    5579   86674   8805    100.0    1.030  !DANGEROUS LOAD-DO NOT USE!
-01.0  113    81.18   2921    5683   90202   8832    100.0    1.013  !DANGEROUS LOAD-DO NOT USE!
+00.0  114    82.00   2948    5789   93910   8857    100.0    0.998  !DANGEROUS LOAD-DO NOT USE!
+01.0  115    82.82   2975    5895   97803   8881    100.0    0.982  !DANGEROUS LOAD-DO NOT USE!
+02.0  116    83.64   3002    6002  101901   8903    100.0    0.967  !DANGEROUS LOAD-DO NOT USE!
+03.0  118    84.46   3029    6110  106214   8924    100.0    0.952  !DANGEROUS LOAD-DO NOT USE!
+04.0  119    85.28   3055    6219  110759   8943    100.0    0.937  !DANGEROUS LOAD-DO NOT USE!
+05.0  120    86.10   3082    6329  115554   8961    100.0    0.922  !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    114    82.00   3025    6096  114779   8515    100.0    0.937  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    114    82.00   2828    5328   75586   9369    100.0    1.081  !DANGEROUS LOAD-DO NOT USE!

Code:
Cartridge          : .375 H.& H. Mag.
Bullet             : .375, 300, Nosler AccuBond 53662
Useable Case Capaci: 74.134 grain H2O = 4.813 cm³
Cartridge O.A.L. L6: 3.600 inch = 91.44 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-17

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   93    66.33   2405    3854   43532   8162     99.4    1.378
-09.0   94    67.07   2432    3939   45031   8223     99.6    1.357
-08.0   95    67.80   2458    4023   46580   8279     99.7    1.336
-07.0   96    68.54   2484    4109   48186   8330     99.8    1.316
-06.0   97    69.28   2509    4195   49851   8377     99.9    1.296
-05.0   98    70.02   2535    4282   51584   8419    100.0    1.277
-04.0   99    70.75   2561    4369   53374   8456    100.0    1.257  ! Near Maximum !
-03.0  100    71.49   2586    4456   55247   8489    100.0    1.238  ! Near Maximum !
-02.0  101    72.23   2612    4544   57185   8522    100.0    1.220  ! Near Maximum !
-01.0  102    72.96   2637    4633   59199   8554    100.0    1.202  ! Near Maximum !
+00.0  103    73.70   2662    4722   61294   8585    100.0    1.184  ! Near Maximum !
+01.0  104    74.44   2687    4811   63475   8616    100.0    1.166  !DANGEROUS LOAD-DO NOT USE!
+02.0  105    75.17   2712    4901   65741   8645    100.0    1.149  !DANGEROUS LOAD-DO NOT USE!
+03.0  106    75.91   2737    4991   68102   8674    100.0    1.132  !DANGEROUS LOAD-DO NOT USE!
+04.0  107    76.65   2762    5082   70529   8702    100.0    1.116  !DANGEROUS LOAD-DO NOT USE!
+05.0  108    77.39   2787    5174   73121   8729    100.0    1.099  !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    103    73.70   2759    5071   74891   8201    100.0    1.101  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    103    73.70   2512    4203   49570   8903     98.2    1.295
 

Bearcat 7000

Beginner
Mar 18, 2018
29
0
Thanks Dr. Mike.. his load is 82.0 gr sent a picture and found a link a guy posted from alliant recommending up to 85.0gr of rl17 with a 300gr Partition. I wonder how rl25 or 26 would do in it..
 
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