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Bullet Baring Surface- How Do You Measure It ??

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  #1  
Unread 11-23-2007, 04:31 AM
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Bullet Baring Surface- How Do You Measure It ??

Just about to start getting real serious about loading a consistantly accurate round for my 338. I was told that measuring the projectiles baring surface was important so I just want to get clear how best to do it ?? Where are the measurements taken from exactly ??

Thanks all !

DUH
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  •   #2  
    Unread 11-23-2007, 04:59 AM
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    Bullet bearing surface

    Get yerself two identical Stony Point or Davidson comparator nosepieces for the caliber you want. Attach them to a caliper. One goes over the bullet point, other over the bullet base. Slide your caliper and measure, sorting bullets into groups. Cull out bullets having the widest discrepancy.
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      #3  
    Unread 11-23-2007, 11:31 AM
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    dnundr;

    Shoot it straight up, really straight, catch it in a bucket on the way down then measure the length of the marks.

    What Gene said is a bit better.;)

    If you're in a hurry set your caliper to the Bore size and slip it over the ogive and make a mark. To make the mark just turn the bullet slightly in the caliper. Slip it over the base and make a mark. A PITA but will do if in a hurry or are impatient waiting the stoney point order to arrive.

    I use a sinclair gizmo that looks like a hex nut. and insert the bullet both ways. Not as good, easy or as fast as the stoney point method though.
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    Unread 11-25-2007, 05:37 AM
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    Roy and Gene,

    Thanks for the handy tip. I'll buy one straight away !

    Thanks boys !

    DUH
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      #5  
    Unread 11-25-2007, 05:52 AM
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    PS-- Can anyone give me a link to a 338 cal Stoney Point bullet comparator please so I can order one.

    Many thanks

    DUH
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    Unread 11-25-2007, 10:00 AM
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    Stoney point was purchased by Hornady not too long ago.

    You will need 2 of these MidwayUSA - Hornady Lock-N-Load Bullet Comparator Insert 338 Diameter

    and 2 of these
    MidwayUSA - Hornady Lock-N-Load Bullet Comparator Body

    A good digital caliper makes using these very quick and accurate.

    Instead, I purchased the headspace kit and the comparator kit, so I could measure all calibers etc. The headspace kit comes with a .330 insert, so measuring the baring surface for 338 can be done without a second .338 insert. The .338 insert is actually .330 and is marked as such.

    MidwayUSA - Hornady Lock-N-Load Headspace Gage 5 Bushing Set with Comparator
    MidwayUSA - Hornady Lock-N-Load Bullet Comparator Complete Set with 14 Inserts



    AJ
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      #7  
    Unread 11-26-2007, 12:10 AM
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    Quote:
    Originally Posted by AJ Peacock View Post
    Stoney point was purchased by Hornady not too long ago.

    You will need 2 of these MidwayUSA - Hornady Lock-N-Load Bullet Comparator Insert 338 Diameter

    and 2 of these
    MidwayUSA - Hornady Lock-N-Load Bullet Comparator Body

    A good digital caliper makes using these very quick and accurate.

    Instead, I purchased the headspace kit and the comparator kit, so I could measure all calibers etc. The headspace kit comes with a .330 insert, so measuring the baring surface for 338 can be done without a second .338 insert. The .338 insert is actually .330 and is marked as such.

    MidwayUSA - Hornady Lock-N-Load Headspace Gage 5 Bushing Set with Comparator
    MidwayUSA - Hornady Lock-N-Load Bullet Comparator Complete Set with 14 Inserts



    AJ

    AJ

    If I was going to only use it for my 338 which is the cheapest way to go ? I think my friend has a headspace guage ? Many thanks for your help

    DUH
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