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General >> Ammunition, reloading, shooting, etc >> 2400 load....
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Message started by leadhead on Dec 11th, 2018 at 2:18am

Title: Re: 2400 load....
Post by Parashooter on Dec 11th, 2018 at 9:55pm
Lyman Cast Bullet Handbook, 3d ed. gives 16 gr. 2400 as starting load for 311290 (208 gr.) @1415 fps. 21 gr. maximum @1716 fps. Tested in 22" barrel.

QuickLOAD estimates ~21K psi for 16.5 gr. - fairly low pressure. (This is not tested data) -

Cartridge          : .30-40 Krag
Bullet             : .308, 202, LYM LRN GC 311299
Cartridge O.A.L. L6: 3.089 inch or 78.46 mm
Barrel Length      : 30.0 inch or 762.0 mm
Powder             : Alliant 2400

Predicted data by increasing and decreasing the given charge,
incremented in steps of 6.061% 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

-12.1   33    14.50   1544    1085   16597   2245    100.0    2.615
-06.1   35    15.50   1610    1180   18765   2367    100.0    2.470
+00.0   37    16.50   1673    1275   21076   2489    100.0    2.343
+06.1   39    17.50   1735    1370   23529   2610    100.0    2.230
+12.1   42    18.50   1794    1465   26128   2729    100.0    2.129
+18.2   44    19.50   1851    1560   28875   2848    100.0    2.038
+24.2   46    20.50   1907    1655   31775   2965    100.0    1.956
+30.3   48    21.50   1961    1751   34830   3081    100.0    1.882

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