1000 Joule @ 100m appears possible with a moderate load of N550 in a 23" barrel. Estimated pressures are well below CIP Pmax of 2600 bar.
Code:
Cartridge : 6 x 70 R
Bullet : .243, 85, Barnes 'TSX' BT 24341
Cartridge O.A.L. L6: 3.425 inch or 87.00 mm
Barrel Length : 23.0 inch or 584.2 mm
Powder : Vihtavuori N550
Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.778% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !
Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Gramm m/s Joule bar bar % ms
-27.8 63 1.357 557 854 1096 332 70.1 1.728
-25.0 65 1.409 576 913 1173 352 72.0 1.681
-22.2 67 1.462 595 975 1256 373 73.9 1.635
-19.4 70 1.514 614 1039 1346 393 75.7 1.590
-16.7 72 1.566 634 1107 1443 414 77.6 1.547
-13.9 75 1.618 654 1178 1548 435 79.4 1.504
-11.1 77 1.670 674 1253 1661 456 81.2 1.462
-08.3 80 1.723 695 1330 1784 477 83.0 1.422
-05.6 82 1.775 716 1411 1917 498 84.7 1.382
-02.8 84 1.827 737 1495 2061 518 86.4 1.344
+00.0 87 1.879 758 1581 2217 538 87.9 1.306 ! Near Maximum !
+02.8 89 1.931 779 1671 2386 557 89.5 1.270 ! Near Maximum !
Tabular trajectory data at Std.ICAO Atmosphere
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Gun / Ammunition : 6 x 70 R
Bullet : .243, 85, Barnes 'TSX' BT 24341
Bullet weight : 85 grains or 5.51 Grams
Muzzle velocity : 758 m/s
Crosswind speed : 4 m/s
Ballistic Coefficient(s) (G1):
C1=0.333@V>0 m/s;
Optimum trajectory information :
Optimum sight-in range (X) = 149 m
with max. ordinate above LOS at range (M)= 81 m
and max. point blank range (P)= 176 m.
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Sight-in clicks, 1 click = 1.0 cm/100 m or 0.394 in/100 m
Height of sight above bore axis = 1.27 cm or 0.50 inch
Gun is zeroed-in at 100 m,
by sighting-in at level firing
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Range Velo Time of Energy Path Deflection Total Sight correction Target
city flight to at crosswind drop for setting new lead
LOS of 4.5 m/s zero range 10 m/s
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·Meter m/s s Joule cm cm MOA cm Clicks MOA m ·
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| 0 758 0.0000 1581 -1.3 0.0 ----- 0.0 ------ ----- 0.00
M 58 708 0.0789 1382 +1.8 1.1 0.62 3.0 -3.2 -1.09 0.79
X 100 674 0.1400 1250 0.0 3.6 1.23 9.2 0.0 0.00 1.40
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