Cartridge : .45-70 Govt. SAAMI
Bullet : .458, 350, Hornady FP 4503
Useable Case Capaci: 60.416 grain H2O = 3.923 cm³
Cartridge O.A.L. L6: 2.550 inch = 64.77 mm
Barrel Length : 18.5 inch = 469.9 mm
Powder : Hodgdon H4198
Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.25% 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
-12.5 67 35.00 1464 1665 19427 3185 79.3 1.602
-11.3 68 35.50 1482 1707 20002 3248 80.0 1.582
-10.0 69 36.00 1501 1750 20591 3311 80.6 1.563
-08.8 70 36.50 1519 1793 21198 3374 81.2 1.544
-07.5 71 37.00 1538 1837 21820 3436 81.8 1.525
-06.3 72 37.50 1556 1882 22459 3499 82.4 1.506
-05.0 73 38.00 1575 1927 23117 3561 83.0 1.488
-03.8 74 38.50 1593 1973 23791 3623 83.6 1.470
-02.5 75 39.00 1612 2019 24481 3685 84.2 1.453 ! Near Maximum !
-01.3 76 39.50 1630 2065 25197 3746 84.8 1.436 ! Near Maximum !
+00.0 76 40.00 1649 2113 25930 3807 85.3 1.419 ! Near Maximum !
+01.3 77 40.50 1667 2160 26681 3868 85.9 1.402 ! Near Maximum !
+02.5 78 41.00 1686 2209 27455 3928 86.4 1.385 !DANGEROUS LOAD-DO NOT USE!
+03.8 79 41.50 1704 2257 28245 3988 87.0 1.369 !DANGEROUS LOAD-DO NOT USE!
+05.0 80 42.00 1723 2307 29054 4048 87.5 1.353 !DANGEROUS LOAD-DO NOT USE!
+06.3 81 42.50 1741 2356 29882 4107 88.0 1.338 !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 76 40.00 1742 2357 29938 4025 92.1 1.338 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 76 40.00 1542 1848 21988 3483 76.8 1.515Cartridge : .45-70 Govt. SAAMI
Bullet : .458, 405, Woodleigh FN 30B
Useable Case Capaci: 55.247 grain H2O = 3.587 cm³
Cartridge O.A.L. L6: 2.550 inch = 64.77 mm
Barrel Length : 18.5 inch = 469.9 mm
Powder : Hodgdon H4198
Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.37% 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
-13.7 66 31.50 1336 1605 19409 2929 81.3 1.739
-12.3 67 32.00 1354 1650 20039 2992 82.0 1.715
-11.0 68 32.50 1373 1695 20689 3055 82.6 1.691
-09.6 69 33.00 1392 1742 21357 3117 83.3 1.668
-08.2 70 33.50 1410 1788 22047 3180 84.0 1.646
-06.9 71 34.00 1429 1836 22756 3242 84.6 1.624
-05.5 72 34.50 1447 1884 23486 3303 85.2 1.602
-04.1 73 35.00 1466 1932 24233 3365 85.9 1.581 ! Near Maximum !
-02.7 74 35.50 1484 1981 25012 3426 86.5 1.560 ! Near Maximum !
-01.4 75 36.00 1503 2031 25810 3486 87.1 1.539 ! Near Maximum !
+00.0 76 36.50 1521 2081 26627 3546 87.6 1.519 ! Near Maximum !
+01.4 77 37.00 1540 2132 27465 3606 88.2 1.500 !DANGEROUS LOAD-DO NOT USE!
+02.7 78 37.50 1558 2184 28323 3665 88.8 1.480 !DANGEROUS LOAD-DO NOT USE!
+04.1 79 38.00 1577 2236 29202 3724 89.3 1.461 !DANGEROUS LOAD-DO NOT USE!
+05.5 80 38.50 1595 2288 30104 3782 89.8 1.443 !DANGEROUS LOAD-DO NOT USE!
+06.9 82 39.00 1613 2341 31032 3839 90.4 1.424 !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 76 36.50 1603 2312 30683 3714 93.9 1.434 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
