Overfilling 243 win mag case

Discussion in 'Reloading' started by mosh338, Dec 13, 2013.

  1. mosh338

    mosh338 Active Member

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    Apr 25, 2013
    Hi

    Ive been reloading for 243 win mag with 87 grain Hornaday V max. I find that with 47 grains Somchem S 385 powder I find that the powder is just below the case mouth and the bullet seats on the powder.

    Is this a problem?
     
  2. jimbires

    jimbires Well-Known Member

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    Mar 16, 2008
    I'm assuming you are talking about a 243wssm . if this is what you have my quickload shows 47 grains at 100.7% case fill . max is 49.4 grains at 105.8 % case fill . so this should be ok , as far as a compressed load goes . are you using a funnel with a drop tube ? a drop tube funnel will help settle the powder for easier bullet seating . usually about 105% case fill is about as full as I want to work with .



    if you are working with a 243 win 47 grains will be 101.2 % case fill .
     

  3. Mikecr

    Mikecr Well-Known Member

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    I use a long droptube on a funnel myself. But powder 'fit' for a given capacity really comes down to SLOWER filling.
    Don't drop the powder in the case. Pour it, slowly.
     
  4. mosh338

    mosh338 Active Member

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    Apr 25, 2013
    Thanks guys

    I'm using a 243 win mag with a conventional funnel and drop tube. I was just concerned when I saw that the powder was just below the mouth. I have loaded progressively up from 45 grains so I should pick up any pressure problems. My main concern was that I was compressing the powder when seating the bullet.
     
  5. HARPERC

    HARPERC Well-Known Member

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    Most manuals identify compressed loads as such. The Nosler I have lists % of case capacity. Compressed loads are a fact of life with some combinations.

    I like loads that are slightly compressed, but still slightly below what most sources identify as maximum. Just me.
     
  6. wstanton

    wstanton Well-Known Member

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    Jun 17, 2011
    Mosh, You should be fine, finding powders that are near the fill capacity for a case have the tendency to be more accurate. I fill my .243 up all the way with H-1000 and it loves it!