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Thread: Ball micrometers?

  1. #16
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    Quote Originally Posted by Al Nyhus View Post
    ...a flat faced, non ratcheting Mitutoyo micrometer is what I use.

    Good shootin'. -Al
    I believe in having measuring tools in every room on the property so.... I have 2-3 name-brand calipers and some name-brand "reference" mics, also some expensive manual models of each, and literally dozens of others, copycats/knockoffs.

    Everyone in the house knows that it's a sin to leave dad's measurers closed...... "use 'em, but put them back like you found 'em"

    I found the following to be humourous......

    I have a ChiCom digital Micrometer that reads to the "half-billionth" like all the "good" ones and is wikkid good. As repeatable as a gage block, but the ratchet is on backwards! The monkeyboys who pirated the thing were too iggerent to know WHY there's a ratchet so they just "put a ratchet mechanism on there!"

    The thing just suuuucks to use. I'm the kinda' guy who, when I put my little tape away I'm halfway acros't the job before it's retracted and when I go to spin this mic back open for the next measure it sounds like the sun going down on cicadas......if I could superglue the ratchet, I would.

  2. #17
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    I use 1/10,000 dial indicator and a Sinclair jig that uses a rod for the anvil.

    Give the case a gentle spin and watch the variation all the way around.

    It really matters at the edges of the accuracy game sine it c enter the bullet up in the leade if the case is uniform all the way around.

    But an off center bullet is going to center up, right?
    What could it really matter?

  3. #18
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    I have tubing mics, but.......

    .....my runout fixture, with "tenth" indicator, is much more handy.

    Kevin

  4. #19
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    Quote Originally Posted by brickeyee View Post
    ..........................
    But an off center bullet is going to center up, right?
    ...............................What could it really matter?
    How could an off center bullet possibly "center up?" What's the driver, the mechanism for this? To me this is the same as pretending individual bullets in groups "converge with distance cuz they fall asleep"

    Matter? I guess this is for you to decide



    EDITED TO ADD..... I just re-read your post....

    Methinks I was hasty.

    And misunderstood ye

    apologies
    Last edited by alinwa; 09-13-2019 at 02:42 AM.

  5. #20
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    Quote Originally Posted by Kevin Gullette View Post
    .....my runout fixture, with "tenth" indicator, is much more handy.

    Kevin

    Kevin, I see that checking runout, but how does it measure thickness?

  6. #21
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    Thumbs up Butch........

    Good point.

    The fixture is mainly for neck-wall thickness runout comparison.....from case to case.

    The tubing mics.....yes....for neck thickness. But also compared with outside mics, measuring loaded round outside neck diameter.

    But.......then there's the bullet, itself, runout......sigh....

    Kevin

  7. #22
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    Quote Originally Posted by Kevin Gullette View Post
    Good point.

    The fixture is mainly for neck-wall thickness runout comparison.....from case to case.

    The tubing mics.....yes....for neck thickness. But also compared with outside mics, measuring loaded round outside neck diameter.

    But.......then there's the bullet, itself, runout......sigh....

    Kevin
    Kevin, We will be in WF for Judge "Barney" Fudge's retirement party on Oct 4 and our Burkburnett HS reunion on the 5th.Our class get together will be at Barney's place. I haven't been that way in years.

  8. #23
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    https://www.sinclairintl.com/reloadi...prod36959.aspx

    With a 1/10,000 dial indicator it works very nicely.

    You can rotate the shell around and determine the variation in the wall thickness.

  9. #24
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    Quote Originally Posted by brickeyee View Post
    https://www.sinclairintl.com/reloadi...prod36959.aspx

    With a 1/10,000 dial indicator it works very nicely.

    You can rotate the shell around and determine the variation in the wall thickness.

    Well! I'll be damned!

  10. #25
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    Butch........

    You should have an easy time, getting through town.........

    That's because, some years back, they installed two elevated "scars" across town. In their infinite wisdom......they also managed to kill many businesses below the scars.

    On the plus side......the weather's been ok.

    Kevin

  11. #26
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    Quote Originally Posted by Kevin Gullette View Post
    You should have an easy time, getting through town.........

    That's because, some years back, they installed two elevated "scars" across town. In their infinite wisdom......they also managed to kill many businesses below the scars.

    On the plus side......the weather's been ok.

    Kevin

    Yeah I know. Kinda funny looking down at Reagan Jr. High.

  12. #27
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    Quote Originally Posted by Butch Lambert View Post
    Well! I'll be damned!
    For my AI varmint rifles (Panda actions with right bolt, left port), heavy stainless barrels (1 inch OD at the muzzle and 28 inches long), tight necks
    I use bulk buys of commercial brass (couple thousand at a time) and then go to town sorting it out.

    Trim to length.

    Weight is an early one also.

    One of the last sorts is by neck wall variation.

    I separate it into groups with <0.0005 variation, less than 0.001 variation, any any real outliers in another group.
    They are all then neck turned to 0.0100 thick.

    For longer range (6 mm REM AI with low BC bullets) use I can make a group of <0.0002 variation.
    600 yard groundhogs are not hard at all.

  13. #28
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    Why not just use ya vernier?

    I have a ball mike in a stand. It sits under my loading bench. I haven't turned cases in a very long time , years, because I have so many finished cases. The solution to varying case thickness is a smaller sizing bushing. Cases are a holder for the things that really matter, exact charges of powder and bullets that are placed exactly in them, end of story.


    Pete

  14. #29
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    Quote Originally Posted by Pete Wass View Post
    I have a ball mike in a stand. It sits under my loading bench. I haven't turned cases in a very long time , years, because I have so many finished cases. The solution to varying case thickness is a smaller sizing bushing. Cases are a holder for the things that really matter, exact charges of powder and bullets that are placed exactly in them, end of story.


    Pete
    The solution is to turn them.
    Keeping in mind that the variation likely extends to the body of the shell.

    It makes sure the bullet is centered up in the leade.

    Sizing them smaller does nothing to remove the variation that means the bullet is NOT concentric with the bore.

  15. #30
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    I be BET'cha Pete hain't fired an un-turned neck in twenny-thurdy years lol......

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