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range report_m39b_more handloads and..

Discussion in 'Rifle Country' started by _N4Z_, Oct 20, 2008.

  1. _N4Z_

    _N4Z_ Participating Member

    Jun 6, 2005
    Michigander lost in... The Yonders, Oklahoma
    More handloaded 7.62x54r and my 1942 Finn m39b.
    All PRVI brass, all CCI LR primer, all 3 shot groups @ 100 yards.

    Sierra SP ProHunter 180gr / 46gr IMR4320 = 1-7/16"
    Sierra SP ProHunter 180gr / 48.1gr IMR4320 = 1-11/16"
    Sierra HPBT MatchKing 174gr / 48.1gr IMR4320 = 2-1/8"

    Sierra SP ProHunter 180gr / 48gr IMR4350 = 1-5/8"
    Sierra HPBT MatchKing 174gr / 48gr IMR4350 = 5/8"
    Sierra HPBT MatchKing 174gr / 48gr IMR4350 = 11/16"

    The Sierra MK with 48gr of IMR 4350 looks like the tops. Going to load more of that and see if those group sizes continue.

    Which brings me to a question/concern. During the shooting of the above groups a couple pieces of brass suffured odd deformation, and I am not sure why. These were all neck sized cases matched to the rifle, and on their 3rd or 4th firing.

    Here is a pic of the pucker. They are the only 2 of the 18 fired that this happened to.

    Any ideas? :confused:

  2. stubbicatt

    stubbicatt Senior Member

    Aug 23, 2007
    Oil in the chamber which dieseled at that point?

    I've never seen anything like that.

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