What would be a good starting point with RL26 in a 7 SAUM with 160 grain Accubonds?
I was hoping someone else would take a stab at this but here's how I'd figure it.
I think 62 grains was about the top end of the range with a 150 Scenar. So if I was starting over from scratch with the 150 Scenar I'd load up a few rounds each at 60, 61, and 62.
The 160 is about 7% heavier than the 150, and the Scenar has a longer boat tail and longer ogive than the regular Accubond so the Accubond's bearing surface is longer than the Scenar's which means more pressure with the same amount of powder.
So with that and other unknowns, I'd bump the 7% up to 10% and drop down 10% from the starting charge (60 grains) for the 150, and load a few at 54, 55, and 56 to start.
At least that's what I'd do. Either that or find someone to run quickload for you.
Would someone be willing to run that through Quickload for me?
Cartridge : 7 mm Rem SA Ultra Mag
Bullet : .284, 160, Nosler AccuBond 54932
Useable Case Capaci: 62.964 grain H2O = 4.088 cm³
Cartridge O.A.L. L6: 2.820 inch = 71.63 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Alliant Reloder-26
Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.801% 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
-08.0 92 57.39 2754 2694 43318 11530 99.6 1.389
-07.2 93 57.89 2779 2744 44592 11592 99.7 1.370
-06.4 94 58.39 2805 2795 45913 11649 99.8 1.352
-05.6 94 58.89 2830 2846 47275 11702 99.9 1.334
-04.8 95 59.39 2856 2898 48683 11748 100.0 1.316
-04.0 96 59.89 2881 2949 50138 11790 100.0 1.298
-03.2 97 60.39 2906 3001 51645 11826 100.0 1.281
-02.4 98 60.89 2932 3053 53201 11861 100.0 1.264
-01.6 98 61.39 2957 3106 54811 11895 100.0 1.247
-00.8 99 61.89 2982 3158 56478 11929 100.0 1.230 ! Near Maximum !
+00.0 100 62.39 3006 3211 58202 11962 100.0 1.214 ! Near Maximum !
+00.8 101 62.89 3031 3264 59988 11994 100.0 1.198 ! Near Maximum !
+01.6 102 63.39 3056 3317 61836 12025 100.0 1.182 ! Near Maximum !
+02.4 102 63.89 3080 3371 63750 12056 100.0 1.166 ! Near Maximum !
+03.2 103 64.39 3105 3425 65734 12086 100.0 1.151 !DANGEROUS LOAD-DO NOT USE!
+04.0 104 64.89 3129 3479 67780 12115 100.0 1.136 !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 100 62.39 3139 3501 73680 11431 100.0 1.110 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 100 62.39 2800 2786 45033 12328 97.7 1.353
That's what my edition puts it at for reference.
