How To Question????

Discussion in 'Reloading' started by Jim Hundley, Oct 30, 2006.

  1. Jim Hundley

    Jim Hundley Well-Known Member

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    Jan 28, 2005
    What is the most accurate proceedure to measure the berring surface of a bullet?What type of measuring tools are needed?
    Thanks for any help!
    Jimmy
     
  2. MagMan

    MagMan Well-Known Member

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    Bearing surface comparator.
    BSC
     

  3. Jim Hundley

    Jim Hundley Well-Known Member

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    Thanks,Magman.
     
  4. HoytemanPA

    HoytemanPA Well-Known Member

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    Dec 16, 2001
    Davidson Seat Depth Checker

    I use this one for $14.

    If you find inconsistency in measurement, Take a bullet that you are most likely going to be using, coat it with JB and lightly spin it in the tip of the checker. Measurements are very repeatable, I do base/ogive readings on the bullets. You can do bearing surface if you get two, but I've quit doing that. Tool is also invaluable to document loaded round OAL (to ogive). I don't use the base attachment for the cartridge head, just the nose piece.

    Bullets have really come around in the last two years. Three years ago I was finding .020 variance this year it is down to somewhere around 90% +/- .001 8% +/- .002 2% +/- .003

    Thanks goes out to Hornady, Sierra, and Lapua!