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Cartridge : .270 Win. (SAAMI)
Bullet : .277, 150, Nosler BalTip 39588
Useable Case Capaci: 58.917 grain H2O = 3.825 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Alliant Reloder-25
Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.833% 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
-08.3 102 55.00 2806 2622 44905 10405 99.5 1.385
-07.5 103 55.50 2832 2672 46248 10463 99.7 1.366
-06.7 104 56.00 2859 2722 47636 10516 99.8 1.347
-05.8 105 56.50 2885 2773 49071 10564 99.9 1.329
-05.0 106 57.00 2912 2824 50553 10607 100.0 1.311
-04.2 106 57.50 2938 2875 52087 10644 100.0 1.293
-03.3 107 58.00 2964 2927 53671 10677 100.0 1.276
-02.5 108 58.50 2990 2978 55313 10707 100.0 1.258 ! Near Maximum !
-01.7 109 59.00 3016 3030 57010 10737 100.0 1.242 ! Near Maximum !
-00.8 110 59.50 3042 3083 58765 10766 100.0 1.225 ! Near Maximum !
+00.0 111 60.00 3068 3135 60586 10794 100.0 1.208 ! Near Maximum !
+00.8 112 60.50 3094 3188 62447 10822 100.0 1.192 ! Near Maximum !
+01.7 113 61.00 3119 3241 64420 10848 100.0 1.176 !DANGEROUS LOAD-DO NOT USE!
+02.5 114 61.50 3145 3294 66436 10875 100.0 1.161 !DANGEROUS LOAD-DO NOT USE!
+03.3 115 62.00 3170 3348 68538 10900 100.0 1.145 !DANGEROUS LOAD-DO NOT USE!
+04.2 116 62.50 3196 3402 70711 10924 100.0 1.130 !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 111 60.00 3111 3225 64648 10633 100.0 1.177 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 3% relative to nominal value:
-Ba 111 60.00 3018 3034 56728 10976 100.0 1.242 ! Near Maximum !
JD338":3k54ok0a said:RL 22 is a better choice in the 270 Win, right behind H4831.
JD338