Bruce Mc
Handloader
- Oct 26, 2005
- 1,165
- 377
Could I impose on one of y'all to run the 130gr Sierra Gameking in the 270 win running H-4831sc. 22"barrel. The OAL is going to be 3.270"
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Cartridge : .270 Win. (SAAMI)
Bullet : .277, 130, Sierra SPBT 1820
Useable Case Capaci: 61.472 grain H2O = 3.991 cm³
Cartridge O.A.L. L6: 3.270 inch = 83.06 mm
Barrel Length : 22.0 inch = 558.8 mm
Powder : Hodgdon H4831 SC *T
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 96 54.81 2747 2178 44844 11623 90.2 1.195
-09.0 97 55.42 2781 2232 46452 11787 90.8 1.175
-08.0 98 56.03 2815 2287 48124 11949 91.5 1.156
-07.0 99 56.64 2849 2343 49863 12107 92.1 1.137
-06.0 100 57.25 2883 2399 51669 12261 92.7 1.118
-05.0 101 57.86 2917 2457 53553 12412 93.2 1.100
-04.0 102 58.46 2952 2515 55510 12559 93.8 1.081 ! Near Maximum !
-03.0 103 59.07 2986 2575 57552 12701 94.3 1.064 ! Near Maximum !
-02.0 104 59.68 3021 2635 59678 12839 94.8 1.046 ! Near Maximum !
-01.0 105 60.29 3056 2696 61891 12973 95.3 1.029 ! Near Maximum !
+00.0 106 60.90 3091 2758 64200 13102 95.8 1.012 ! Near Maximum !
+01.0 107 61.51 3126 2820 66611 13225 96.2 0.995 !DANGEROUS LOAD-DO NOT USE!
+02.0 108 62.12 3161 2884 69126 13343 96.7 0.979 !DANGEROUS LOAD-DO NOT USE!
+03.0 110 62.73 3196 2948 71753 13456 97.1 0.963 !DANGEROUS LOAD-DO NOT USE!
+04.0 111 63.34 3231 3014 74497 13562 97.4 0.947 !DANGEROUS LOAD-DO NOT USE!
+05.0 112 63.95 3266 3080 77366 13663 97.8 0.931 !DANGEROUS LOAD-DO NOT USE!
Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba 106 60.90 3178 2916 70638 13223 98.1 0.971 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba 106 60.90 2992 2584 58101 12818 92.5 1.058 ! Near Maximum !