IMR4451 quickload
- Thread starter Bucky5
- Start date
DrMike
Ballistician
- Nov 8, 2006
- 37,169
- 5,630
Code:
Cartridge : .243 Win.
Bullet : .243, 85, Sierra HPBT 1530
Useable Case Capaci: 50.272 grain H2O = 3.264 cm³
Cartridge O.A.L. L6: 2.640 inch = 67.06 mm
Barrel Length : 22.0 inch = 558.8 mm
Powder : IMR 4831
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 92 40.68 2856 1540 42759 10796 97.4 1.232
-09.0 93 41.13 2887 1573 44185 10900 97.8 1.214
-08.0 94 41.58 2918 1607 45656 10999 98.2 1.195
-07.0 95 42.04 2949 1641 47174 11093 98.5 1.177
-06.0 96 42.49 2979 1675 48742 11183 98.8 1.159
-05.0 97 42.94 3010 1710 50358 11267 99.0 1.142
-04.0 98 43.39 3040 1745 52030 11346 99.2 1.125 ! Near Maximum !
-03.0 99 43.84 3071 1780 53754 11419 99.4 1.108 ! Near Maximum !
-02.0 100 44.30 3101 1815 55535 11487 99.6 1.092 ! Near Maximum !
-01.0 101 44.75 3131 1850 57373 11549 99.8 1.076 ! Near Maximum !
+00.0 102 45.20 3161 1885 59273 11606 99.9 1.060 ! Near Maximum !
+01.0 103 45.65 3190 1921 61234 11657 99.9 1.045 !DANGEROUS LOAD-DO NOT USE!
+02.0 104 46.10 3220 1957 63261 11701 100.0 1.030 !DANGEROUS LOAD-DO NOT USE!
+03.0 105 46.56 3249 1993 65355 11740 100.0 1.015 !DANGEROUS LOAD-DO NOT USE!
+04.0 106 47.01 3278 2029 67519 11775 100.0 1.000 !DANGEROUS LOAD-DO NOT USE!
+05.0 107 47.46 3307 2065 69756 11809 100.0 0.986 !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 102 45.20 3290 2043 70855 11181 100.0 0.980 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 102 45.20 2972 1667 47870 11576 96.0 1.167- Thread starter
- #3
DrMike
Ballistician
- Nov 8, 2006
- 37,169
- 5,630
Code:
Cartridge : .243 Win.
Bullet : .243, 85, Sierra HPBT 1530
Useable Case Capaci: 50.272 grain H2O = 3.264 cm³
Cartridge O.A.L. L6: 2.640 inch = 67.06 mm
Barrel Length : 22.0 inch = 558.8 mm
Powder : IMR 4451 Enduron
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 84 38.25 2825 1507 43752 10267 94.6 1.196
-09.0 84 38.68 2854 1537 45059 10386 95.0 1.179
-08.0 85 39.10 2883 1569 46402 10501 95.4 1.163
-07.0 86 39.53 2911 1600 47783 10614 95.8 1.147
-06.0 87 39.95 2940 1631 49202 10725 96.2 1.132
-05.0 88 40.38 2969 1663 50661 10832 96.6 1.117
-04.0 89 40.80 2997 1695 52161 10936 97.0 1.102 ! Near Maximum !
-03.0 90 41.23 3025 1728 53703 11037 97.3 1.087 ! Near Maximum !
-02.0 91 41.65 3054 1760 55290 11135 97.6 1.073 ! Near Maximum !
-01.0 92 42.08 3082 1793 56921 11230 97.9 1.059 ! Near Maximum !
+00.0 93 42.50 3110 1826 58598 11321 98.2 1.045 ! Near Maximum !
+01.0 94 42.93 3138 1859 60323 11409 98.4 1.031 !DANGEROUS LOAD-DO NOT USE!
+02.0 95 43.35 3166 1892 62097 11493 98.7 1.018 !DANGEROUS LOAD-DO NOT USE!
+03.0 96 43.78 3194 1926 63923 11573 98.9 1.005 !DANGEROUS LOAD-DO NOT USE!
+04.0 97 44.20 3222 1959 65801 11650 99.1 0.992 !DANGEROUS LOAD-DO NOT USE!
+05.0 97 44.63 3250 1993 67733 11723 99.3 0.979 !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 93 42.50 3236 1977 67665 11211 100.0 0.978 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 93 42.50 2943 1635 49598 10966 92.9 1.131- Thread starter
- #5
