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Author Topic: blue box/brown box, what's the difference ?  (Read 980 times)

Offline barber

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blue box/brown box, what's the difference ?
« on: 05:34 AM, 12/28/12 »
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  • About 8 years ago I shot a 6br, and want to start doing it again. What's the difference between the blue or brown box brass?

    6br Norma, .272" neck chamber.

    Thanks, Barber


    Offline areaone

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    blue box/brown box, what's the difference ?
    « Reply #1 on: 05:49 AM, 12/28/12 »
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  • Neck thickness of the brass, Older brown(GOLD) box has thicker neck than the blue box. Approx .002 difference in thickness.  Older for .272 neck, Blue Box .2704 neck,

    Offline barber

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    blue box/brown box, what's the difference ?
    « Reply #2 on: 06:07 AM, 12/28/12 »
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  • gotcha...

    thanks,  Barber


    Offline GSPV

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    blue box/brown box, what's the difference ?
    « Reply #3 on: 08:03 AM, 12/28/12 »
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  • For those of us with 6BRs with 272 necks, the difference is about $50 per box of 100.   :'(
    Greg J.

    Offline rmist

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    blue box/brown box, what's the difference ?
    « Reply #4 on: 08:07 AM, 12/28/12 »
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  • Will a .271" neck work with the blue box ?
    Job not complete until all implied tasks are completed !

    Offline savagedasher

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    blue box/brown box, what's the difference ?
    « Reply #5 on: 08:29 AM, 12/28/12 »
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  • Yes .271 will be fine with blue box.         Good Shooting Larry


    Offline rmist

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    blue box/brown box, what's the difference ?
    « Reply #6 on: 08:39 AM, 12/28/12 »
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  • Thanx Larry !!
      Dave
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    Offline KevinThomas

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    blue box/brown box, what's the difference ?
    « Reply #7 on: 09:41 AM, 12/28/12 »
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  • Barber,

    Actually, it's not that simple. The change is well under .002", more like .0015", well under .001" per side.
    To be state it more accurately, there wasn't really a "change" in the specs, as the spec dimensions of the brass didn't change at all. We merely had to start running them closer to the center of the tolerance range, as opposed to the high end of the range which we had before. The change in neck thickness was required for CIP compliance, and not an option for us. Unfortunately, this came about at the same time as we were switching to the newer packaging. In otherwords, there isn't a clear delineation between the neck thicknesses of those cases found in cardboard vs. plastic boxes. It just depends on what they had on hand for packaging at the time, until the stocks of cardboard boxes ran out. Bottom line is, whichever box they come in, measure first and turn as required.
    « Last Edit: 11:38 AM, 12/28/12 by Forum Boss »
    Kevin Thomas
    Lapua USA

    Offline johara1

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    blue box/brown box, what's the difference ?
    « Reply #8 on: 10:11 AM, 12/28/12 »
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  •  I found the neck thickness to be less than .001 per side as stated above. I have some running .0117 and they are way shorter 1.555 is the average now. Flash holes are over the place in size.The old stuff ran around 1.570 average in length flash holes were  more uniform and the neck wall was .0125- .013......... jim

    Offline areaone

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    blue box/brown box, what's the difference ?
    « Reply #9 on: 10:51 AM, 12/28/12 »
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  • I have found the new Norma Brass to be very close in neck thicknes to the OLD lapua brass.  I Have both 272 and 2704 chambers,  I have used both brass in the 272 chamber.  Seems to be no noticeable problem, except my loaded round with blue box are .2675, Plenty of room in that 272 chamber ;)


     

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