This should be a bit more realistic, but like I said before, it is best to work up the load over a chronograph. Special attention should be given to the two variations of powder burn rate. Increasing the burn rate by 10% takes a nominal 54kpsi load to a 65+kpsi without a change it charge weight, so as usual work up the load slowly. By that I mean start low (say 96-97gr), if a chronograph is used, a step of 1gr intervals is not out of the question with a case capacity that of the RUM.
The columns read
1st % of 101.1gr
2nd % of case filled
3rd Actual charge weight in grains
4th Velocity in fps
5th Energy in lb*ft
6th Pressure maximum in psi
7th Muzzel pressure in psi
8th % of propellent burned
9th Propellent burn time in milli seconds
Cartridge : .300 Rem Ultra Mag
Bullet : .308, 210, Berger M T VLD
Useable Case Capaci: 101.203 grain H2O = 6.571 cm³
Cartridge O.A.L. L6: 3.675 inch = 93.35 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Hodgdon US 869
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 81 80.88 2256 2372 28270 10451 79.3 1.783
-18.0 83 82.90 2316 2500 30086 10866 80.9 1.741
-16.0 85 84.92 2376 2633 32034 11281 82.4 1.701
-14.0 87 86.95 2438 2772 34134 11693 83.9 1.660
-12.0 90 88.97 2501 2916 36402 12102 85.3 1.621
-10.0 92 90.99 2564 3065 38841 12505 86.8 1.581
-08.0 94 93.01 2628 3221 41472 12900 88.1 1.543
-06.0 96 95.03 2693 3382 44313 13287 89.5 1.504
-04.0 98 97.06 2759 3548 47376 13663 90.7 1.467
-02.0 100 99.08 2825 3721 50653 14026 91.9 1.429
+00.0 102 101.10 2892 3899 54165 14375 93.1 1.393
+02.0 104 103.12 2959 4083 57956 14707 94.2 1.351 ! Near Maximum !
+04.0 106 105.14 3027 4273 62062 15020 95.2 1.308 ! Near Maximum !
+06.0 108 107.17 3096 4469 66514 15312 96.1 1.265 !DANGEROUS LOAD-DO NOT USE!
+08.0 110 109.19 3165 4671 71351 15582 96.9 1.224 !DANGEROUS LOAD-DO NOT USE!
+10.0 112 111.21 3235 4879 76616 15826 97.6 1.184 !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 102 101.10 3074 4406 65680 14787 98.4 1.280 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 102 101.10 2667 3318 43258 13240 83.9 1.505