270 Weatherby Quick Load Request
- Thread starter wbyfan1
- Start date
DrMike
Ballistician
- Nov 8, 2006
- 37,966
- 7,874
Code:
Cartridge : .270 Weath. Mag.
Bullet : .277, 130, Nosler AccuBond 54987
Useable Case Capaci: 74.326 grain H2O = 4.826 cm³
Cartridge O.A.L. L6: 3.280 inch = 83.31 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Norma MRP *C
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 89 63.72 3058 2700 44419 12152 98.1 1.355
-09.0 90 64.43 3093 2762 46010 12267 98.5 1.333
-08.0 91 65.14 3128 2824 47662 12376 98.8 1.312
-07.0 92 65.84 3163 2888 49375 12477 99.1 1.291
-06.0 93 66.55 3198 2951 51143 12572 99.3 1.270
-05.0 94 67.26 3232 3016 52966 12661 99.5 1.250
-04.0 95 67.97 3267 3080 54852 12742 99.7 1.230 ! Near Maximum !
-03.0 96 68.68 3301 3145 56804 12815 99.8 1.211 ! Near Maximum !
-02.0 97 69.38 3335 3211 58827 12882 99.9 1.192 ! Near Maximum !
-01.0 98 70.09 3369 3277 60922 12940 100.0 1.173 ! Near Maximum !
+00.0 99 70.80 3403 3343 63094 12991 100.0 1.155 ! Near Maximum !
+01.0 100 71.51 3437 3409 65345 13037 100.0 1.137 !DANGEROUS LOAD-DO NOT USE!
+02.0 101 72.22 3470 3476 67678 13081 100.0 1.119 !DANGEROUS LOAD-DO NOT USE!
+03.0 102 72.92 3504 3543 70098 13124 100.0 1.102 !DANGEROUS LOAD-DO NOT USE!
+04.0 103 73.63 3537 3611 72607 13167 100.0 1.085 !DANGEROUS LOAD-DO NOT USE!
+05.0 104 74.34 3570 3678 75211 13208 100.0 1.068 !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 99 70.80 3546 3631 77037 12483 100.0 1.064 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 99 70.80 3189 2935 49730 13097 96.7 1.277DrMike
Ballistician
- Nov 8, 2006
- 37,966
- 7,874
Code:
Cartridge : .270 Weath. Mag.
Bullet : .277, 140, Nosler AccuBond 54765
Useable Case Capaci: 73.342 grain H2O = 4.762 cm³
Cartridge O.A.L. L6: 3.280 inch = 83.31 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Norma MRP *C
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 88 61.92 2960 2724 44496 12018 98.7 1.398
-09.0 89 62.61 2993 2785 46064 12124 99.0 1.375
-08.0 90 63.30 3026 2847 47679 12225 99.2 1.354
-07.0 91 63.98 3059 2909 49342 12319 99.5 1.332
-06.0 92 64.67 3092 2972 51060 12406 99.6 1.311
-05.0 93 65.36 3124 3035 52836 12486 99.8 1.291
-04.0 94 66.05 3157 3098 54674 12560 99.9 1.271 ! Near Maximum !
-03.0 95 66.74 3189 3162 56575 12626 100.0 1.251 ! Near Maximum !
-02.0 96 67.42 3221 3226 58542 12685 100.0 1.232 ! Near Maximum !
-01.0 97 68.11 3253 3290 60577 12738 100.0 1.213 ! Near Maximum !
+00.0 98 68.80 3285 3355 62684 12788 100.0 1.195 ! Near Maximum !
+01.0 98 69.49 3317 3420 64864 12837 100.0 1.177 !DANGEROUS LOAD-DO NOT USE!
+02.0 99 70.18 3348 3485 67122 12886 100.0 1.159 !DANGEROUS LOAD-DO NOT USE!
+03.0 100 70.86 3380 3551 69461 12933 100.0 1.141 !DANGEROUS LOAD-DO NOT USE!
+04.0 101 71.55 3411 3617 71883 12979 100.0 1.124 !DANGEROUS LOAD-DO NOT USE!
+05.0 102 72.24 3442 3683 74393 13024 100.0 1.107 !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 98 68.80 3417 3630 76299 12303 100.0 1.102 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 98 68.80 3086 2961 49484 13002 97.4 1.320
gerry
Ammo Smith
- Mar 1, 2007
- 7,067
- 2,257
Looks to be some good speed with both bullets.
- Thread starter
- #5
DrMike
Ballistician
- Nov 8, 2006
- 37,966
- 7,874
Code:
Cartridge : .270 Weath. Mag.
Bullet : .277, 140, Nosler AccuBond 54765
Useable Case Capaci: 73.342 grain H2O = 4.762 cm³
Cartridge O.A.L. L6: 3.280 inch = 83.31 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : IMR 7828 SSC
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 89 61.56 2950 2706 44865 11840 96.4 1.372
-09.0 90 62.24 2984 2768 46414 11968 96.8 1.351
-08.0 91 62.93 3018 2832 48022 12092 97.2 1.329
-07.0 92 63.61 3052 2896 49689 12210 97.6 1.308
-06.0 93 64.30 3086 2961 51415 12322 98.0 1.288
-05.0 94 64.98 3120 3026 53209 12428 98.3 1.268
-04.0 95 65.66 3154 3092 55068 12529 98.6 1.248 ! Near Maximum !
-03.0 96 66.35 3187 3158 56997 12623 98.9 1.228 ! Near Maximum !
-02.0 97 67.03 3221 3226 59001 12711 99.1 1.209 ! Near Maximum !
-01.0 98 67.72 3255 3293 61081 12792 99.4 1.191 ! Near Maximum !
+00.0 98 68.40 3288 3361 63240 12867 99.5 1.172 ! Near Maximum !
+01.0 99 69.08 3322 3430 65484 12934 99.7 1.154 !DANGEROUS LOAD-DO NOT USE!
+02.0 100 69.77 3355 3499 67815 12995 99.8 1.136 !DANGEROUS LOAD-DO NOT USE!
+03.0 101 70.45 3388 3568 70242 13049 99.9 1.119 !DANGEROUS LOAD-DO NOT USE!
+04.0 102 71.14 3421 3638 72762 13095 100.0 1.102 !DANGEROUS LOAD-DO NOT USE!
+05.0 103 71.82 3454 3709 75385 13134 100.0 1.085 !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 98 68.40 3434 3665 76790 12372 100.0 1.083 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 98 68.40 3079 2948 51012 12700 94.6 1.288- Thread starter
- #7
DrMike
Ballistician
- Nov 8, 2006
- 37,966
- 7,874
wbyfan1":11uibqq6 said:
I neglected to run it. Here it is, however. Late, but complete.
Code:
Cartridge : .270 Weath. Mag.
Bullet : .277, 130, Nosler AccuBond 54987
Useable Case Capaci: 74.325 grain H2O = 4.826 cm³
Cartridge O.A.L. L6: 3.280 inch = 83.31 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : IMR 7828 SSC
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 90 63.00 3030 2651 44244 11861 95.3 1.339
-09.0 91 63.70 3066 2713 45788 11999 95.8 1.318
-08.0 92 64.40 3102 2777 47389 12131 96.3 1.297
-07.0 92 65.10 3137 2841 49048 12258 96.7 1.276
-06.0 93 65.80 3173 2906 50772 12380 97.2 1.256
-05.0 94 66.50 3209 2972 52561 12496 97.6 1.236
-04.0 95 67.20 3244 3038 54417 12605 97.9 1.217 ! Near Maximum !
-03.0 96 67.90 3280 3105 56340 12709 98.3 1.197 ! Near Maximum !
-02.0 97 68.60 3315 3173 58349 12806 98.6 1.178 ! Near Maximum !
-01.0 98 69.30 3351 3241 60430 12897 98.9 1.160 ! Near Maximum !
+00.0 99 70.00 3386 3310 62593 12981 99.1 1.142 ! Near Maximum !
+01.0 100 70.70 3421 3379 64840 13058 99.3 1.124 !DANGEROUS LOAD-DO NOT USE!
+02.0 101 71.40 3457 3449 67181 13128 99.5 1.106 !DANGEROUS LOAD-DO NOT USE!
+03.0 102 72.10 3492 3520 69614 13190 99.7 1.089 !DANGEROUS LOAD-DO NOT USE!
+04.0 103 72.80 3527 3590 72148 13245 99.8 1.072 !DANGEROUS LOAD-DO NOT USE!
+05.0 104 73.50 3562 3662 74785 13293 99.9 1.055 !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 99 70.00 3546 3629 76169 12538 100.0 1.053 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 99 70.00 3162 2887 50540 12678 93.4 1.256
