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Thread: Case headstamp and seating depth

  1. #21
    Join Date
    25th September 2006
    Location
    South of Lake Superior
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    123
    Just for comparison purposes, there's a chart showing bullet setbacks of my lead bullet handloads and some commercial ammunition. . .
    BulletSetbackSummarya Rounds Pushed Further Into The Case, Post 13.jpg
    . . .and why I described your setbacks as excessive.
    When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]
    Likes (1) :
    Murray (27th April 2022)


  2. #22
    Join Date
    7th May 2021
    Posts
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    Ah yes, I remember seeing that one. I know you've already decided on the subject, but I still think there's a book in there with all these graphics you've come up with over the years.

    After thinking it over, it bothers me that I may have gotten the rounds out of order or had other variations in the mix. My new plan is to reload another box exactly as I did before, then go through the measure, chamber, eject cycle all in one shot at the range, but like you did here with top round on a full 7 round mag.

    If I get ambitious, I have some Armscor on hand as well. It's probably not the same as what you have above, but it's as close as I can get to a reference against it.

  3. #23
    Join Date
    25th September 2006
    Location
    South of Lake Superior
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    These setback tests can be done safely at home if the firing pin is removed from the test gun. If the FPS won't stay in position, just tape it in place.

    Doing this will avoid the pressure by other shooters at the range to make the firing line safe.

    The data you provided in Post #18 tends to indicate reducing your excessive setback can only come through modifying your reloading procedures. The S & B cases I've measured show they're thick enough to provide a better grip on a jacketed bullet as long as:

    The fired cases are resized to a sufficiently small ID,
    The case mouths are flared as little as possible,
    The case neck expanding plug on your expanding/flaring die is not too large,
    The bullet OD's are large enough to stretch the case mouth during seating for a good grip on the bullet (sensed by the resistance felt in the press handle during seating),
    Little or nothing is done to the case mouth after the bullet is seated.

    Matter of fact, your test handloads don't even need to be primed or filled with powder - they're just dummies to be slingshotted.
    When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]
    Last edited by niemi24s; 30th April 2022 at 16:45.


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