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case pressures

Discussion in 'Reloading' started by Snapper2, Apr 11, 2010.

  1. Snapper2

    Snapper2

    2,413
    5
    Feb 22, 2008
    s.east Texas
    I've worked up a accurate and safe load in 400 corbon using accurate arms data. Using formed 45super brass and #9 with cci 350 primers. I want to use this load in starline 400 corbon brass with fiocchi small rifle primers. I've read where #9 needs a mag primer for a complete burn, but how should this standard small rifle primer effect pressure compared to the 350 primers? I do realize 400corbon brass(45auto+p) has a little less case capacity than standard 45 brass.
     
  2. fredj338

    fredj338

    22,629
    1,430
    Dec 22, 2004
    so.cal.
    Small rifle rpimers bunr pretty hot, hotter than most mag pistol primers. Work the load up, hoepfully using a chronograph. I load for several wildcats & w/o a chronograph, you are really flying blind.
     

  3. Snapper2

    Snapper2

    2,413
    5
    Feb 22, 2008
    s.east Texas
    Amen to that. Corbon claims that swapping a srp for a spp wont hurt,they do recommend rem7.5 in small rifle. Their data using 155xtp,#7,and wsp is 12.6-14.(I dont have spp so I have not gone this high.) Accurate Arms data using formed 45 brass with the same bullet,powder,and 350 primers is 11.1-12.3. I've had no problems working up a this load with #7 and a small rifle primer and stopping at 12gr. While Corbon has no data with #9, accurate arms does, and I'm afraid changing primers with #9 might set off a cannon.:wow:
     
  4. fredj338

    fredj338

    22,629
    1,430
    Dec 22, 2004
    so.cal.
    Well, back of & work up carefully. My own test w/ the 357sig show 75fps-90fps vel increase w/ the same powder charge. I don't know if that is translating into higher pressures or more efficient powder burn w/ the slow ball powder.
     
    Last edited: Apr 11, 2010