The chronograph protection program PT 2

Discussion in 'Ammunition & Reloading' started by Benchrest, Sep 5, 2015.

  1. Benchrest

    Benchrest
    The Desert Planet
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    After almost three months of no trigger time I finally got to go shooting :D

    Having about 40 loads to chrono (yes, really), and NOT wanting an early demise for my 3rd chrono, I came up with the ridiculous :)

    Some actual thought went into this: Protect the chrono from up-to hot 10mm loads; Small / portable / under 10lbs; Couldn't be reactive.

    A scrap piece of AR500 steel would have done the trick, but hitting it from 10' wasn't something I was interested in trying.

    Stopbox :)

    4 layers of 13-ply Baltic birch, loose framing nails, and a couple of bricks.

    stopbox1.jpg

    stopbox2.jpg

    Of course, it had to be tested :D

    10mm 180gr @ 1,250, and a 155XTP around 1,350.

    stopbox3.jpg

    stopbox4.jpg

    Both loads I'd consider 'warm', and while they went cleanly through the plywood, they stopped fairly shallow into the nails.

    stopbox5.jpg

    For a kludged together idea it worked pretty well :)

    The other component is the chrono's Digital Link - This worked perfectly.

    Easy to read output on a tablet.

    chrono-link-display.jpg

    Name a string (ex: 10mm 155XTP XX.Xgr Powder) and start shooting - Later you can export your strings in CSV format for spreadsheet use, or a .pdf.

    CSV-export-spreadsheet.jpg

    http://webcity.net/benchrest/10mm_401_145_13_4_7.pdf

    Perfect weather, beautiful day, and I DIDN'T shoot my chrono :)

    Next time out I'm out I think I'll hit the box with a .308 :D
     
  2. Darkker

    Darkker
    Mesa, Wa
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    ... So you've already shot TWO chronographs?o_O

    Nice idea, if you need it.
     
  3. Certaindeaf

    Certaindeaf
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    I like it.. and you'll have a ready supply of #8 sinkers if you ever need to make field repairs or fabricate a target stand. Win!
     
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  4. Benchrest

    Benchrest
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    In my defense, it wasn't an inability to aim, rather being cognizant of a certain pistol's rear sight issue.

    My lack of awareness cost $300, and two bricks.
     
  5. Benchrest

    Benchrest
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    Don't think I didn't see what you did there ;)
     
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  6. P7id10T

    P7id10T
    West Slope
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    Curious: why not sand instead of nails?
     
  7. Certaindeaf

    Certaindeaf
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    Yelling "Nailed it!" while dancing a little jig is just so much more satisfying.
     
  8. Benchrest

    Benchrest
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    Didn't have sand?

    :)

    Other than the bricks, I just used what I had on hand. I wanted it to have enough mass so it wouldn't slam into the chono, knocking it over. I wanted the front to be non-reactive, minimizing any chance of injury from ricochet. The nails - high mass, energy absorbing through movement, relatively 'soft'. The bricks, last line of defense.

    It was just a quick 'what if' project that, very surprisingly, worked as imagined.

    I'm sure there's a 100 variations that would achieve the same result :)
     
    Last edited: Sep 8, 2015
  9. Benchrest

    Benchrest
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    Isn't it your nap time!
     
  10. P7id10T

    P7id10T
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    Somehow that's just not as satisfying as Gene Hackman, playing Popeye Doyle, yelling "Bullseye!" as he grabs a nice rack....
     
  11. elsie

    elsie
    Way over there on the left
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    Besides, sand would just leak out of the hole and make a mess... B-)


    elsie
     
  12. Velzey

    Velzey
    Oregon
    Büchsenmacher Bronze Vendor Bronze Supporter

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    Note to self, don't let Benchrest near my chrony...:)
     
  13. Benchrest

    Benchrest
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    Hey, it's the Parker's fault!

    :D
     

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