Seating Depth Affected By Powder Charge?

Discussion in 'Reloading' started by Propdoc03, Jul 8, 2011.

  1. Propdoc03

    Propdoc03 Well-Known Member

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    Dec 25, 2006
    Trying to get back int he game.
    Wasnt sure what to title this as and it has probably been covered, I just couldnt find it in the archives.

    Once you find a seating depth that works well with your rifle is it affected by changes in powder charge and/or temp/altitude/pressures?

    I studied the ladder test and the getting the most out of VLD's and am still not quite sure of what new method I want to go by. I am working with the VLD hunters in both my 7RM mag and 300 WSM. Starting from scratch with both rigs.

    I guess I first need to find my max charge but if I can first find what my seating depth is that may make tomorrow a more productive day? Will only have a few hours before it gets too hot to shoot.

    Wide open to methods of madness an anything else.

    Many Thanks
    PD
     
  2. Scout1

    Scout1 Well-Known Member

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    Oct 10, 2009
    Start with the longest COAL that will fit and cycle in your magazine. Find your max load there. Run a OCW round robin 3 rounds at each charge weight starting from a charge weight at least 4 percent back from your max. Once you find at least a 1 grain spread with a common POI you can start to adjust seating depth to tighten it up.

    Read this, OCW Overview - Dan Newberry's OCW Load Development System
     

  3. Propdoc03

    Propdoc03 Well-Known Member

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    Dec 25, 2006
    Very Good, thanks Scout1!

    So, Ill add to this while I am here, looking for any OCW loads. Heres what I have to work with.

    H4831 SC, VV N560, RL 19, R 22, R 25. Varget.

    300 WSM VLD Hunters 180, 190, 200. Nosler Accubond 200. Sierra Hornady 165 IBS

    7mm RM, 180 grn VLD Hunters.

    Thanks!
    PD
     
  4. Scout1

    Scout1 Well-Known Member

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    I was shooting the 175 VLD's with VVN-560. It was a pretty hot load of 72.5 grns so please work up safely.

    I am currently testing the 208 A-max and RL-17 with very good results so far.
     
  5. Scout1

    Scout1 Well-Known Member

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    Those loads above are in a WSM.