Load Development Question

Discussion in 'Reloading Forum (All Calibers)' started by Mikemci, Sep 13, 2017.

  1. Mikemci

    Mikemci

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    When working on load development, which do you do first and why do you think it is superior to the other?
    1) Find your most accurate powder weight.
    2) Find the best seating depth.

    Thanks, Mike
     
  2. TheOtherZilla

    TheOtherZilla

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    Personally I look at powder first.. Then when I get things as accurate as I can and decide on a load I start tweaking further to see if there is an improvement
     
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  3. BoydAllen

    BoydAllen Gold $$ Contributor

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    Generally, I start with light marks on the bullet and look for a charge. After I have one, I play with seating depth.
     
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  4. PatMiles

    PatMiles Silver $$ Contributor

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    Light marks as in touching the lands?
     
  5. savagedasher

    savagedasher Gold $$ Contributor

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    First thin I do after the case is fire forum
    I do a careful case prep trim uniform the primer pockets . Then I carefully check the internal case volume . Some I mark the with 1 for lite middle no marks heavy with two . X on the ones that. Are out of range .
    I have found that Tenth of a grain change in the case I get the same SD . Or they basically print the same on paper tunner setting is close on all three . Larry
     
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  6. Toby Bradshaw

    Toby Bradshaw Gold $$ Contributor

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    Both at the same time, as described in Tony Boyer's book.

    Here's an example with my 30BR -- three powder charges (33.5-34.7gr H4198) and 4 seating depths (Wilson stem measurements, so longer is farther from jam). 3-shot groups @ 100yd.

    30BR charge and seating depth2 copy.jpg
     
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  7. BoydAllen

    BoydAllen Gold $$ Contributor

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    Yes, a little farther in than touching, so that the marks are about a third as long as wide. To better see marks, I press a wad of 0000 steel wool around the bullet of a loaded round, and then turn the round while holding pressure on the bullet. This makes very fine scorings around the bullet, that do not hurt a thing and which make rifling marks much easier to see.
     
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  8. Intheshop

    Intheshop

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    Bullet fit first here.
     
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  9. PatMiles

    PatMiles Silver $$ Contributor

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    What's up with the flyers on the left side? :D

    Sorry, I just had to do it.
     
  10. Mikemci

    Mikemci

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    Toby, all of those groups are quite good!
    It seems like your rifle favors the 1.747 depth and combination of that and 34.7 gr. is deadly.
     

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