Bullets - Variation w/in a box of 100

Discussion in 'Reloading' started by scoutm, Aug 26, 2012.

  1. scoutm

    scoutm Well-Known Member

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    Jun 24, 2009
    It's too dang hot to do anything outdoors today so I decided to see what kind of weight variation I had in a new box of 130 grn bullets. I was a bit surprised with what I found:

    129.5 gr 1
    129.6 gr 2
    129.7 gr 1
    129.8 gr 10
    129.9 gr 21
    130.0 gr 24
    130.1 gr 19
    130.2 gr 17
    130.3 gr 5

    Total 100

    I guess what surprised me is I expected to see a little taller bell shaped curve and one that wasn't shifted to the high side.

    Is this pretty normal? What do you do with the outliers +/- .2 grs?
     
  2. rscott5028

    rscott5028 Well-Known Member

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    Apr 18, 2010
    not too surprising

    weight is less of an issue than bearing surface and meplat uniformity provided that the bullets are well balanced

    I've seen up to .8 grain extreme spread from a box of 500 142 SMKs which I sorted and grouped by bearing surface length

    and, it was a pretty tight bell curve around the mean as I recall

    -- richard
     

  3. Bart B

    Bart B Well-Known Member

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    Testing for accuracy, I've shot 30 caliber Sierra 155's with 8/10ths grain spread in weight into sub 1/2 MOA at 800 yards. And 30 caliber 190's and 200's into sub 1/2 MOA at 1000; they also had 8/10ths grain spread in weight. Not one of all these bullets had a nose job nore were sorted by bearing length. But they did have up to 3/1000ths runout stuck in case mouths.
     
  4. Joe King

    Joe King Well-Known Member

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    Apr 29, 2012
    Get a box of Amax! I gave up and lumped em together by 0.2gr, still ended up with 5 batches. Bergers are waaaaaaaaaaaay better about consistency
     
  5. Mikecr

    Mikecr Well-Known Member

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    That's +/- .001 G1BC, .0005 G7BC

    I'm an a$$ about my bullet dimensions, & even I don't bother to weigh them!