NATO CCI 34 primers and load impact

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  • Warpspasm

    Ultimate Member
    Aug 2, 2010
    1,771
    Harford, Co.
    WOW.

    Change in primers.

    Change in COAL.

    Change in bullet.

    And you wonder why the load won't shoot? :lol2:

    This thing keeps getting crazier. I just came back from the range a bit ago and I'm beginning to think that my "good" load was nothing more than a fluke on the day I tried it.

    CCI #34 - Rounds: 6 shots, Avg. 2303, Extreme Spread 235, SD 89
    CCI#200 - Rounds: 10 shots, Avg. 2206, Extreme Spread 91, SD 26

    Noticeable differences between the two loads. But, my "good load" almost shot at bad as my bad load today. I think I'm going back to square one and use 150gr ball ammo (instead of match) with a different tried and true powder. I need to get a good baseline before I do anything else.
     

    Warpspasm

    Ultimate Member
    Aug 2, 2010
    1,771
    Harford, Co.
    Just a few weeks ago, but the weather has changed pretty dramatically since then. I was thinking that too while I was shooting today. IMR4895 isn't a particularly temperature insensitive powder. However, I don't think there was a big difference in temps when I first tried the load with the #34 primers.
     

    Magnumite

    Ultimate Member
    Dec 17, 2007
    6,561
    Harford County, Maryland
    It seems odd you shot those development loads for enough of a day to see stable groups then it falls apart. If this was a tight sweet spot amid large groups (����) then I would say definitely unstable load. When I evaluate a load I go by chrono data, how the load groups on either side of the tight group load, and group shape. There shouldn't be large deviation from one load increment to the next.

    I am thinking more the rifle than the load. As mentioned before hammer fall andcup hardness. While not familiar with your model rifle, I have seen going from warm and humid to cool and dry wreak havoc...especially when I was shooting my Ruger M77 in 30-06 a good bit. Bedding the stock ended all that.

    Your chrono data does indicate undesirable characteristics. Check the rifle well...weather change coincides with your group deterioration. Maybe a slightly faster powder if the rifle checks out.

    The military ammo you mentioned (or reloaded equivilent you mentioned) would be a good starting point. As it is both load and rifle are suspect.
     

    Warpspasm

    Ultimate Member
    Aug 2, 2010
    1,771
    Harford, Co.
    Unfortunately, the MAS 49/56 isn't as easy to take apart as other battle rifles. The French designed it so a soldier in the field couldn't FUBAR it. It's easy as hell to field strip and clean, but beyond that I can't even find any instructions on the proper way to disassemble the rifle. Everything seems tight, but it might be TOO tight somewhere..
     

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