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Thread: Max powder load for different bullets of equal weight

  1. #1

    Max powder load for different bullets of equal weight

    Should bullets of equal weight but different manufacturers have a similar max powder load if using the same powder? For instance:

    According to Hornady manual #7 - 180 gr XTP has a max load of 12.6 grains of Alliant 2400
    According to Nosler manual #6 - 180 gr Partition has a max load of 10 grains of Alliant 2400

    Why the difference?

  2. #2
    Are they using the same OAL? If so the bullets may be different enough that one has more in the case reducing case volume. For example a round nose FMJ compared with a flat nose FMJ let alone if hollowpoints vs FMJ or all copper bullet is used.

  3. #3
    Site Supporter
    Join Date
    Feb 2011
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    NH
    Different companies might also be using different equipment to collect the pressure data. Some may also be more risk adverse than others. Ironically, Hornady load data is usually on the conservative side.

  4. #4
    Member
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    Dec 2021
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    Deep South
    One possibility is that bullets of different designs could have different bearing surface lengths, resulting in different pressures when loaded with the same powder charge. Another possibility is that a harder bullet, like solid copper bullets or bullets with thicker jackets or solid bases, could also produce higher pressures.

  5. #5
    Site Supporter richiecotite's Avatar
    Join Date
    Jul 2013
    Location
    Woodbridge, VA
    Bullet profile, construction material and bearing surface will all play a part in determining pressure and powder charge.


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