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Thread: Whats your favorite 308 seating depth and why? DBM bolt rifles

  1. #1
    Administrator 1911's Avatar
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    Whats your favorite 308 seating depth and why? DBM bolt rifles

    I have been running 2.80, 2.81 and 2.85. I have heard some guys going as far out as 2.9.

    The last batch of test rounds I loaded, I did 5 at 2.80, 5 at 2.83 and 5 at 2.85, this is probably the best way to test seat depths and look for differences, but figured it didnt hurt to ask what you guys are doing.

    Edit: I guess I should have set a bullet weight criteria. I am using 168's and 175's. Mostly SMK's

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  2. #2
    Expert marksman
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    I was running 2.815-2.82 until I had to borrow a friends rifle in a match. I then went to 2.81

    Most of my load development was based on factory ammo duplication

    To note that SMK'S love "jump" rather then jammed into the lands.


  3. #3
    Super Moderator Sinus211's Avatar
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    My first 308 loads were out at 2.92 til I added the DBM and realized that wasn't gonna work.

    Been loading at 2.85 and had no issues with mag clearance or feeding.


  4. #4
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    Did some chronographing today and had some interesting results. Tested two different loads with seating depths of 2.810 and 2.850 and the results were quite dramatic.
    All my brass had been prepped, trimmed, flash holes deburred and primer pockets uniformed.

    One load was 41.8gr of IMR 4064 and other was 43.5gr of IMR 4895, both loads shot 80fps faster at 2.810 than the loads seated at 2.850 and produced better groups. My cousin shot the same through his R700 with the same results.

    www.seattleguns.net

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