Cast bullets labeled 180gr. TC .358" but weigh 170gr. Load for....?

Discussion in 'Ammunition & Reloading' started by dgang, Oct 6, 2019.

  1. dgang

    dgang Member

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    Uncovered a stash of NBC cast bullets from years ago. They are labeled .358" 180gr. TC but weigh 170. gr. Would a high alloy mix account for 10 gr. of weight? Do I load for 180gr. or 170gr.? Planning on using 13 gr. of 2400. Sound right?
    Thanks in advance, dgang
     
    Last edited: Oct 6, 2019
  2. OldManMontgomery

    OldManMontgomery Active Member

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    .358 Winchester, .35 Whelen, .35 Remington and lever guns chambered for .357 Magnum all have .358" diameter bores. And .357 Magnum revolvers, of course. From the load you mention, I assume the latter.

    The Lyman #50 book had loading information for a 170 grain cast lead bullet in .357 Magnum. If the bullets weight 170 grains, I would use that information. (Why the discrepancy? Could be mislabeled; I don't know.) My book has a start load of 9.7 grains and a maximum load of 13.5 grains; using 2400 powder.

    Sounds to me like your proposed 13 grains would be too close to the top for me as a starting load.
     

  3. SGWGunsmith

    SGWGunsmith Well-Known Member Supporter

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    A high "tin" content used in the casting mix could also account for the lighter actual weight of those bullets.
     
    Rifling82 likes this.
  4. dgang

    dgang Member

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    I think that the bullets were mislabeled, it would take a lot of alloy to make a 10 gr. difference in a 180 gr. bullet.
    I did load them at 13 gr. of 2400, made for a nice solid load with no signs of over pressure. Will put them through my Chrony when the weather breaks., expect about 1175 - 1200 fps with my 4" barrel. Thanks to all and good shooting'.
     
    Last edited: Nov 14, 2019
  5. crossfire

    crossfire Member

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    Measure the seating depth and load for whichever weight bullet it's closest to.