Working with load data and trying to understand why predictions are not close to actual.
I'm loading this as pictured but actual velocities are almost 200 fps faster than quickload.
62.5 gr H1000 3246 fps avg 16 ES 8 SD
What am I missing here?
Cartridge : 6.5 mm RSAUM
Bullet : .264, 123, Lapua Scenar GB489 6032 G7
Useable Case Capaci: 65.256 grain H2O = 4.237 cm³
Cartridge O.A.L. L6: 2.795 inch = 70.99 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Hodgdon H1000 *T
Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% 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
-20.0 84 49.76 2388 1557 26827 9743 84.3 1.636
-18.0 86 51.00 2454 1644 28687 10134 86.1 1.594
-16.0 88 52.25 2520 1735 30679 10516 87.8 1.553
-14.0 90 53.49 2588 1829 32820 10887 89.4 1.512
-12.0 92 54.74 2656 1927 35124 11245 90.9 1.472
-10.0 94 55.98 2725 2028 37606 11587 92.4 1.430
-08.0 96 57.22 2794 2133 40278 11912 93.7 1.383
-06.0 98 58.47 2864 2241 43165 12217 94.9 1.338
-04.0 100 59.71 2934 2352 46283 12499 96.1 1.294
-02.0 102 60.96 3005 2466 49656 12756 97.0 1.252
+00.0 105 62.20 3075 2583 53310 12987 97.9 1.210
+02.0 107 63.44 3146 2703 57278 13189 98.6 1.171 ! Near Maximum !
+04.0 109 64.69 3217 2826 61589 13360 99.2 1.132 ! Near Maximum !
+06.0 111 65.93 3287 2951 66285 13497 99.6 1.095 !DANGEROUS LOAD-DO NOT USE!
+08.0 113 67.18 3358 3079 71412 13600 99.9 1.059 !DANGEROUS LOAD-DO NOT USE!
+10.0 115 68.42 3428 3209 77019 13667 100.0 1.024 !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 105 62.20 3250 2885 65007 12723 100.0 1.111 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 105 62.20 2840 2203 43223 12319 90.0 1.337
