257 Weatherby n560 quick load
- Thread starter hoyt-6190
- Start date
DrMike
Ballistician
- Nov 8, 2006
- 36,902
- 5,063
Code:
Cartridge : .257 Weath. Mag
Bullet : .257, 115, Barnes 'TSX' 30224
Useable Case Capaci: 76.071 grain H2O = 4.939 cm³
Cartridge O.A.L. L6: 3.170 inch = 80.52 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Vihtavuori N560 *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 84 60.30 3082 2426 45446 13487 96.9 1.389
-09.0 85 60.97 3116 2480 46923 13632 97.3 1.368
-08.0 86 61.64 3150 2534 48445 13772 97.7 1.348
-07.0 87 62.31 3184 2589 50012 13906 98.0 1.328
-06.0 88 62.98 3217 2643 51628 14035 98.4 1.308
-05.0 89 63.65 3251 2699 53293 14157 98.7 1.289
-04.0 90 64.32 3284 2755 55009 14274 98.9 1.270 ! Near Maximum !
-03.0 91 64.99 3318 2811 56777 14384 99.2 1.251 ! Near Maximum !
-02.0 92 65.66 3351 2867 58599 14488 99.4 1.233 ! Near Maximum !
-01.0 93 66.33 3384 2924 60477 14585 99.5 1.215 ! Near Maximum !
+00.0 94 67.00 3417 2981 62414 14676 99.7 1.197 ! Near Maximum !
+01.0 94 67.67 3450 3039 64410 14760 99.8 1.180 !DANGEROUS LOAD-DO NOT USE!
+02.0 95 68.34 3482 3097 66468 14837 99.9 1.163 !DANGEROUS LOAD-DO NOT USE!
+03.0 96 69.01 3515 3155 68591 14906 100.0 1.147 !DANGEROUS LOAD-DO NOT USE!
+04.0 97 69.68 3547 3213 70780 14969 100.0 1.130 !DANGEROUS LOAD-DO NOT USE!
+05.0 98 70.35 3579 3271 73038 15025 100.0 1.114 !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 94 67.00 3563 3242 74445 14192 100.0 1.107 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 94 67.00 3208 2628 50528 14497 95.3 1.317DrMike
Ballistician
- Nov 8, 2006
- 36,902
- 5,063
Code:
Cartridge : .257 Weath. Mag
Bullet : .257, 110, Nosler AccuBond 53742
Useable Case Capaci: 76.606 grain H2O = 4.974 cm³
Cartridge O.A.L. L6: 3.170 inch = 80.52 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Vihtavuori N560 *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 85 61.20 3136 2402 45289 13500 96.4 1.368
-09.0 86 61.88 3171 2456 46776 13649 96.9 1.347
-08.0 87 62.56 3206 2510 48309 13793 97.3 1.326
-07.0 88 63.24 3241 2565 49890 13932 97.7 1.306
-06.0 89 63.92 3275 2620 51519 14065 98.0 1.287
-05.0 90 64.60 3310 2676 53199 14192 98.3 1.268
-04.0 90 65.28 3344 2732 54931 14313 98.6 1.249 ! Near Maximum !
-03.0 91 65.96 3379 2788 56717 14427 98.9 1.230 ! Near Maximum !
-02.0 92 66.64 3413 2845 58559 14536 99.1 1.212 ! Near Maximum !
-01.0 93 67.32 3447 2902 60458 14637 99.3 1.195 ! Near Maximum !
+00.0 94 68.00 3481 2960 62417 14732 99.5 1.177 ! Near Maximum !
+01.0 95 68.68 3515 3017 64437 14820 99.7 1.160 !DANGEROUS LOAD-DO NOT USE!
+02.0 96 69.36 3548 3076 66522 14901 99.8 1.143 !DANGEROUS LOAD-DO NOT USE!
+03.0 97 70.04 3582 3134 68673 14975 99.9 1.127 !DANGEROUS LOAD-DO NOT USE!
+04.0 98 70.72 3615 3193 70892 15042 100.0 1.110 !DANGEROUS LOAD-DO NOT USE!
+05.0 99 71.40 3649 3251 73183 15101 100.0 1.095 !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 94 68.00 3634 3226 74562 14268 100.0 1.087 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 94 68.00 3264 2602 50425 14482 94.8 1.295
Code:
Cartridge : .257 Weath. Mag
Bullet : .257, 115, Nosler PART SP 16318
Useable Case Capaci: 77.120 grain H2O = 5.007 cm³
Cartridge O.A.L. L6: 3.170 inch = 80.52 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Vihtavuori N560 *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 84 60.66 3077 2417 45172 13599 96.9 1.394
-09.0 84 61.33 3110 2470 46631 13746 97.3 1.373
-08.0 85 62.01 3144 2524 48133 13888 97.7 1.353
-07.0 86 62.68 3178 2578 49681 14024 98.0 1.333
-06.0 87 63.36 3211 2633 51275 14155 98.4 1.313
-05.0 88 64.03 3245 2688 52917 14279 98.6 1.293
-04.0 89 64.70 3278 2744 54609 14398 98.9 1.275 ! Near Maximum !
-03.0 90 65.38 3311 2799 56352 14510 99.1 1.256 ! Near Maximum !
-02.0 91 66.05 3344 2855 58148 14616 99.4 1.238 ! Near Maximum !
-01.0 92 66.73 3377 2912 59998 14715 99.5 1.220 ! Near Maximum !
+00.0 93 67.40 3410 2969 61905 14808 99.7 1.202 ! Near Maximum !
+01.0 94 68.07 3442 3026 63870 14893 99.8 1.185 !DANGEROUS LOAD-DO NOT USE!
+02.0 95 68.75 3475 3083 65895 14972 99.9 1.168 !DANGEROUS LOAD-DO NOT USE!
+03.0 96 69.42 3507 3141 67983 15044 100.0 1.152 !DANGEROUS LOAD-DO NOT USE!
+04.0 97 70.10 3539 3199 70135 15109 100.0 1.135 !DANGEROUS LOAD-DO NOT USE!
+05.0 97 70.77 3571 3257 72354 15166 100.0 1.119 !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 67.40 3556 3229 73775 14326 100.0 1.111 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 93 67.40 3201 2617 50172 14619 95.3 1.322
Code:
Cartridge : .257 Weath. Mag
Bullet : .257, 120, Nosler PART SP 35643
Useable Case Capaci: 76.728 grain H2O = 4.982 cm³
Cartridge O.A.L. L6: 3.170 inch = 80.52 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Vihtavuori N560 *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 83 60.12 3039 2461 45900 13643 97.5 1.407
-09.0 84 60.79 3072 2514 47372 13784 97.9 1.386
-08.0 85 61.46 3105 2568 48887 13920 98.2 1.366
-07.0 86 62.12 3137 2623 50448 14050 98.5 1.346
-06.0 87 62.79 3170 2678 52055 14174 98.8 1.326
-05.0 88 63.46 3203 2733 53710 14292 99.0 1.306
-04.0 89 64.13 3235 2788 55414 14404 99.3 1.287 ! Near Maximum !
-03.0 90 64.80 3267 2844 57169 14509 99.5 1.269 ! Near Maximum !
-02.0 91 65.46 3299 2900 58977 14608 99.6 1.250 ! Near Maximum !
-01.0 92 66.13 3331 2957 60838 14701 99.7 1.232 ! Near Maximum !
+00.0 92 66.80 3363 3014 62756 14786 99.9 1.215 ! Near Maximum !
+01.0 93 67.47 3395 3071 64732 14865 99.9 1.198 !DANGEROUS LOAD-DO NOT USE!
+02.0 94 68.14 3426 3128 66768 14937 100.0 1.181 !DANGEROUS LOAD-DO NOT USE!
+03.0 95 68.80 3458 3186 68865 15002 100.0 1.164 !DANGEROUS LOAD-DO NOT USE!
+04.0 96 69.47 3489 3243 71027 15061 100.0 1.148 !DANGEROUS LOAD-DO NOT USE!
+05.0 97 70.14 3520 3301 73255 15120 100.0 1.132 !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 92 66.80 3501 3266 74653 14284 100.0 1.124 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 92 66.80 3163 2667 50965 14701 96.0 1.335
