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Message started by Ed on Nov 10th, 2011 at 10:02pm

Title: Re: Recommendatons for reloading 180 grain sp for Krag
Post by Parashooter on Nov 15th, 2011 at 11:22pm
Personally, I put a good bit of faith in IMR's pressure-tested data for IMR powders. This from an ancient DuPont-era booklet -

.30-40 KRAG
WIN. CASE; WIN. 8 1/2-120 PR
REM. 180 GR. SPCL
.308" DIA.; 25.5" BBL.; 3.00" C.O.L.

Powder Grains Vel. C.U.P.
SR 4759 24.0 1940 39100
IMR 4227 23.0 1900 37800
IMR 4198 29.5 2150 39800
IMR 3031 38.0 2375 39300
IMR 4064 41.0 2435 39000
IMR 4895 35.5 2270 38800
IMR 4320 35.5 2210 38100
IMR 4350 46.0C 2445 38700
IMR 4831 49.0C 2425 35900

C=Compressed load

Oddly enough, the same data is currently on the Hodgdon website but with a Speer bullet and longer OAL. They have, however, removed the data for 4227 and 4198 - neither of which are particularly well-suited for this application anyhow.

Cartridge:       30-40 Krag
Load Type:       Rifle

     Maximum Loads
     
Bullet Weight (Gr.)      Mfg.      Powder      Bullet Diam.      C.O.L.                       Grs.      Vel. (ft/s)      Pressure      
180 GR. SPR GS SP       IMR       IMR 4831       .308"       3.090"                      49.0C       2425       35.900 CUP              
180 GR. SPR GS SP       IMR       IMR 4350       .308"       3.090"                      46.0C       2445       38,700 CUP              
180 GR. SPR GS SP       IMR       IMR 4320       .308"       3.090"                      35.5       2210       38,100 CUP              
180 GR. SPR GS SP       IMR       IMR 4064       .308"       3.090"                      41.0       2435       39,000 CUP              
180 GR. SPR GS SP       IMR       IMR 4895       .308"       3.090"                      35.5       2270       38,800 CUP              
180 GR. SPR GS SP       IMR       IMR 3031       .308"       3.090"                      38.0       2375       39,300 CUP              
180 GR. SPR GS SP       IMR       SR 4759       .308"       3.090"                      24.0       1940       39,100 CUP

If one trusts IMR data, 46 grains of 4350 shouldn't normally be an overload for these bullets in .30-40.

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