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General >> Ammunition, reloading, shooting, etc >> Summary on W.A. .30
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Message started by butlersrangers on Jun 7th, 2019 at 7:03pm

Title: Re: Summary on W.A. .30
Post by Parashooter on Jun 8th, 2019 at 7:00pm

butlersrangers wrote on Jun 8th, 2019 at 6:36pm:
. . . Any figures on chamber pressures with IMR-4895 and 220 grain projectiles?

No pressures from Sierra manual (testing done in 22" Krag, no pressure gun).

QuickLOAD gives estimates (in CIP piezo psi) -

Cartridge          : .30-40 Krag
Bullet             : .308, 220, Woodleigh FMJ 65
Cartridge O.A.L. L6: 3.089 inch or 78.46 mm
Barrel Length      : 22.0 inch or 558.8 mm
Powder             : IMR 4895

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.941% 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

-11.8   72    30.00   1837    1649   27694   6150     95.8    1.682
-08.8   75    31.00   1891    1747   29864   6369     96.8    1.631
-05.9   77    32.00   1945    1848   32192   6574     97.7    1.582
-02.9   80    33.00   1998    1950   34686   6765     98.5    1.535
+00.0   82    34.00   2051    2055   37364   6940     99.1    1.489

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