Thread: Powder for 6.5 06 and 140gr projectile

Just teasing - when your blood pressure is back to normal . . . .

Cartridge : 6.5-06 A-Square
Bullet : .264, 140, Sierra SPBT 1730
Useable Case Capaci: 62.717 grain H2O = 4.072 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length : 25.0 inch = 635.0 mm
Powder : Hodgdon H4831

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 48.00 2533 1995 37585 10394 93.2 1.527
-18.0 88 49.20 2596 2095 40265 10696 94.3 1.477
-16.0 90 50.40 2659 2198 43146 10984 95.4 1.430
-14.0 92 51.60 2722 2303 46212 11257 96.3 1.385
-12.0 94 52.80 2785 2411 49473 11514 97.1 1.341
-10.0 96 54.00 2848 2521 52965 11754 97.8 1.299
-08.0 98 55.20 2910 2633 56709 11974 98.4 1.259 ! Near Maximum !
-06.0 100 56.40 2973 2747 60726 12174 99.0 1.220 ! Near Maximum !
-04.0 103 57.60 3035 2863 65040 12353 99.4 1.183 !DANGEROUS LOAD-DO NOT USE!

The last load at 57.60gn at 65040 psi is "possibly" OK, it might be prudent to consider 57.0 as max