Krag Collectors Association Forum Archive
General >> Ammunition, reloading, shooting, etc >> ERROR IN LYMAN 50th RELOADING MANUAL FOR KRAG
http://www.kragcollectorsassociation.org/cgi-bin/yabb2/YaBB.pl?num=1585099192

Message started by Mike4MSU on Mar 25th, 2020 at 1:19am

Title: Re: ERROR IN LYMAN 50th RELOADING MANUAL FOR KRAG
Post by Parashooter on Apr 13th, 2020 at 3:54am

FredC wrote on Mar 31st, 2020 at 6:13pm:
. . . Maybe Parashooter could run quick load on the offending Lyman recommendation. . .

Doesn't look real bad. Note pressure estimates are CIP piezo (PMAX 47137psi).

Cartridge          : .30-40 Krag
Bullet             : .308, 180, Hornady RN 3075
Cartridge O.A.L. L6: 3.089 inch or 78.46 mm
Barrel Length      : 30.0 inch or 762.0 mm
Powder             : IMR 4895

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.25% 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

-05.0   84    38.00   2450    2399   36939   5329     99.1    1.635
-03.8   85    38.50   2477    2453   38212   5380     99.3    1.612
-02.5   86    39.00   2505    2508   39529   5428     99.5    1.587
-01.3   88    39.50   2532    2562   40890   5473     99.7    1.563  ! Near Maximum !
+00.0   89    40.00   2559    2618   42296   5515     99.8    1.540  ! Near Maximum !
+01.3   90    40.50   2586    2673   43751   5554     99.9    1.518  ! Near Maximum !
+02.5   91    41.00   2613    2728   45254   5590    100.0    1.496  ! Near Maximum !
+03.8   92    41.50   2639    2784   46810   5622    100.0    1.474  ! Near Maximum !
+05.0   93    42.00   2666    2840   48418   5652    100.0    1.453  !DANGEROUS LOAD-DO NOT USE!

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