Seating Depth Testing: Round Robin or All At Once?

Discussion in 'Reloading Forum (All Calibers)' started by Winny94, Sep 9, 2019.

  1. Winny94

    Winny94

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    Im doing the Berger course depth ladder test later this week (2 3-rd groups of 4 different jumps). Im wondering if I should shoot 3 shot groups of each depth, or shoot in a round robin style? (regardless im left with 8 different 3-shot groups - just trying to decide if I should shoot those groups individually or round robin)

    thanks
     
    Last edited: Sep 9, 2019
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  2. garandman

    garandman Bolt Gun Bodacious Gold $$ Contributor

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    I settle on what powder charge, then I tweak seating depth. Its got me under half MoA.

    In reality I see no reason why the order matters as the best load is gonna be a specific charge at specific seating depth.

    Id recommend 5 shot groups, of all one depth at once.
     
  3. Alex Wheeler

    Alex Wheeler Gold $$ Contributor

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    I assume your shooting a ladder format based on your question, I will do either depending on conditions. If its really good, round robin, but usually groups.
     
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  4. Winny94

    Winny94

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    Correct. The Berger method is a form of a ladder in .040 jumps. Ill edit my original question to clear that up a bit.
    THanks for the input!
     
  5. garandman

    garandman Bolt Gun Bodacious Gold $$ Contributor

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    To me... 0.040 jumps are YUUUUGE. I go 0.005 jumps.
     
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  6. jepp2

    jepp2 Gold $$ Contributor

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    For the VLD's, Berger recommends 0.040" jumps and you pick the group that stands out. Then you go with the smaller increments. That is based on their findings of what works best.
     
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  7. Nick Caprinolo

    Nick Caprinolo Gold $$ Contributor

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    I do two, three round groups, for each step. This shows me that one good group is not a fluke.
     
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  8. garandman

    garandman Bolt Gun Bodacious Gold $$ Contributor

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    Gotcha.
     
  9. Winny94

    Winny94

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    Yea, I had to re-read it several times. It "feels" wrong, but everyone ive spoken with says it works. Check it out:
    https://bergerbullets.com/vld-making-shoot/
     
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  10. Butte Sink

    Butte Sink

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    Good input on the round robin
    I’m doing the same this coming weekend with a 210 VLD and will go that route
    Thanks
     
  11. Coyotefurharvester

    Coyotefurharvester

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    So do you start with the loads furthest off the lands, in case the longer jump shows best groups early in test ? Then seat remaining rounds deeper to test between the steps. Asking about hunting rifle, since I don't shoot targets or steel.
     
  12. Dusty Stevens

    Dusty Stevens COVFEFE- Thread Derail Crew Gold $$ Contributor

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    Shoot each group together. Too much time for conditions to change for “round robin” to have any place in shooting groups
     
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  13. Dusty Stevens

    Dusty Stevens COVFEFE- Thread Derail Crew Gold $$ Contributor

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    And stop shooting at 2 shots if it sucks. The third shot wont make it smaller.
     
  14. SPJ

    SPJ Gold $$ Contributor

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    I’ll shoot these at 550 yards’ one point of aim probably a round robin I’ll make that call at the range
    Alright I chickened out and shot groups. Looks like green 3/4 vertical at 550 is this weeks winner ...
     

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    Last edited: Sep 13, 2019 at 9:29 PM
  15. Canadian bushman

    Canadian bushman Silver $$ Contributor

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    I never shoot round robin, i dont feel changing point of aim, moving the gun, or picking your head up more often do anything for a group.
     
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  16. daleboy

    daleboy Silver $$ Contributor

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    I don't understand this "Round Robin" approach...what can be learned from introducing all the extra variables ?
     
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  17. Tim Singleton

    Tim Singleton Silver $$ Contributor

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    Sounds cool tho!
     
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  18. SPJ

    SPJ Gold $$ Contributor

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    Well I’ve been meaning to try it but for some reason I chicken out at the last minute and shoot groups.
    There’s a few real accomplished shooters I’ve talked to that say it’s a good way to test for mid range and beyond.
    Hopefully or at least in my Mind I’ll reduce some variables by using one point of aim and not shifting my rear bag around.
    The other thought is barrel heat distribution throughout the test would evened out.
     
  19. Dusty Stevens

    Dusty Stevens COVFEFE- Thread Derail Crew Gold $$ Contributor

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    Would a group be more consistent if shot all at once or over a few minutes time- counting wind and fouling wise?
     
  20. garandman

    garandman Bolt Gun Bodacious Gold $$ Contributor

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    Round robin introduces unnecessary complexity to the process.
     
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