Cartridge : .280 Ack Imp
Bullet : .284, 131, Hammer HH
Useable Case Capaci: 66.066 grain H2O = 4.290 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length : 24.0 inch = 609.6 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 97 59.49 2876 2405 43980 10808 90.9 1.243
-09.0 98 60.15 2912 2466 45649 10956 91.6 1.222
-08.0 99 60.81 2948 2528 47385 11101 92.2 1.201
-07.0 100 61.47 2985 2591 49194 11241 92.8 1.181
-06.0 101 62.13 3021 2655 51076 11378 93.4 1.161
-05.0 102 62.80 3058 2719 53038 11511 94.0 1.141
-04.0 103 63.46 3094 2785 55083 11639 94.5 1.122
-03.0 104 64.12 3131 2851 57215 11763 95.1 1.103 ! Near Maximum !
-02.0 105 64.78 3168 2919 59436 11882 95.6 1.084 ! Near Maximum !
-01.0 106 65.44 3204 2987 61757 11995 96.0 1.066 ! Near Maximum !
+00.0 107 66.10 3241 3056 64178 12104 96.5 1.048 ! Near Maximum !
+01.0 108 66.76 3278 3126 66709 12208 96.9 1.031 !DANGEROUS LOAD-DO NOT USE!
+02.0 110 67.42 3315 3197 69354 12305 97.3 1.013 !DANGEROUS LOAD-DO NOT USE!
+03.0 111 68.08 3352 3269 72120 12397 97.7 0.996 !DANGEROUS LOAD-DO NOT USE!
+04.0 112 68.74 3389 3341 75013 12483 98.0 0.979 !DANGEROUS LOAD-DO NOT USE!
+05.0 113 69.41 3426 3415 78042 12563 98.3 0.963 !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 107 66.10 3332 3229 70834 12171 98.6 1.006 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba 107 66.10 3138 2864 57886 11883 93.3 1.097 ! Near Maximum !Cartridge : .280 Ack Imp
Bullet : .284, 169, Hammer HH
Useable Case Capaci: 62.043 grain H2O = 4.028 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length : 24.0 inch = 609.6 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 93 53.82 2579 2496 44716 10503 94.7 1.378
-09.0 94 54.42 2609 2555 46340 10628 95.2 1.356
-08.0 95 55.02 2640 2615 48025 10750 95.7 1.334
-07.0 96 55.61 2670 2676 49773 10867 96.1 1.312
-06.0 97 56.21 2701 2737 51589 10981 96.6 1.291
-05.0 98 56.81 2731 2799 53475 11090 97.0 1.271
-04.0 99 57.41 2762 2862 55433 11195 97.3 1.250 ! Near Maximum !
-03.0 100 58.01 2792 2925 57469 11296 97.7 1.230 ! Near Maximum !
-02.0 101 58.60 2823 2990 59580 11392 98.0 1.211 ! Near Maximum !
-01.0 102 59.20 2853 3054 61767 11483 98.3 1.191 ! Near Maximum !
+00.0 103 59.80 2883 3120 64039 11569 98.6 1.173 ! Near Maximum !
+01.0 104 60.40 2914 3186 66400 11650 98.9 1.154 !DANGEROUS LOAD-DO NOT USE!
+02.0 106 61.00 2944 3252 68854 11726 99.1 1.136 !DANGEROUS LOAD-DO NOT USE!
+03.0 107 61.59 2974 3320 71407 11796 99.3 1.118 !DANGEROUS LOAD-DO NOT USE!
+04.0 108 62.19 3005 3387 74064 11861 99.5 1.101 !DANGEROUS LOAD-DO NOT USE!
+05.0 109 62.79 3035 3456 76830 11920 99.6 1.084 !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 103 59.80 2954 3274 70426 11488 99.8 1.128 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba 103 59.80 2801 2944 57757 11499 96.3 1.225 ! Near Maximum !
I about got my Sako 85 Bavarian in 7x64 instead of 25-06 and the lack of heavier bullets in 1:10 turned me away from it… now I primarily shoot light monos, fast in a 280. Oh how opinions change
