DrMike
Ballistician
- Nov 8, 2006
- 37,169
- 5,630
I worked up a load for one of my .280s. The load was built around 150 grain ABLR. The load worked reasonably well this past season, accounting for a muley (http://www.noslerreloading.com/viewtopic.php?f=5&t=26233) and a fine elk (http://www.noslerreloading.com/viewtopic.php?f=5&t=25444&hilit=150+ABLR). The load was built with 60.0 grains of VN560, producing a velocity of ~3100 fps. With the latest update from QL, I ran this data and discovered that I was quite close to what is projected. The load does not show any signs of pressure in my firearms system, though the projection is slightly over pressure. On the whole, the old method works; but it sure is nice to have the new methodology to project before I get to the range.
Code:
Cartridge : .280 Rem.
Bullet : .284, 150, Nosler Accubond LR 58734 G7
Useable Case Capaci: 59.185 grain H2O = 3.843 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Vihtavuori N560
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 85 47.36 2343 1829 29130 9083 83.2 1.568
-18.0 87 48.54 2407 1930 31153 9429 84.8 1.527
-16.0 89 49.73 2471 2034 33327 9769 86.4 1.487
-14.0 91 50.91 2536 2142 35660 10101 87.9 1.448
-12.0 93 52.10 2601 2253 38161 10424 89.3 1.405
-10.0 96 53.28 2666 2368 40869 10736 90.6 1.360
-08.0 98 54.46 2732 2487 43777 11036 91.9 1.316
-06.0 100 55.65 2799 2609 46912 11322 93.1 1.274
-04.0 102 56.83 2865 2734 50296 11593 94.2 1.233 ! Near Maximum !
-02.0 104 58.02 2932 2863 53954 11847 95.3 1.194 ! Near Maximum !
+00.0 106 59.20 2999 2996 57913 12083 96.2 1.156 ! Near Maximum !
+02.0 108 60.38 3066 3131 62204 12299 97.0 1.119 !DANGEROUS LOAD-DO NOT USE!
+04.0 110 61.57 3133 3270 66865 12493 97.8 1.084 !DANGEROUS LOAD-DO NOT USE!
+06.0 113 62.75 3201 3412 71934 12665 98.4 1.049 !DANGEROUS LOAD-DO NOT USE!
+08.0 115 63.94 3268 3557 77459 12812 98.9 1.016 !DANGEROUS LOAD-DO NOT USE!
+10.0 117 65.12 3335 3705 83491 12933 99.4 0.984 !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 106 59.20 3170 3347 71074 12060 99.8 1.062 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 106 59.20 2776 2567 46576 11402 88.1 1.276