Don't understand treating copper plated like lead bullets

Discussion in 'The Ammo & Reloading Forum' started by dsv424, Nov 13, 2009.

  1. dsv424

    dsv424 New Member

    Oct 27, 2008
    Garland, Tx.
    I'm confused by that statement JLA:confused:. I would have thought doing this would just be a light load for a jacketed bullet. Although I would never take this route, I might go the other way (substituting jacketed data for lead data and use the low end jacket data). I'm missing something here, could you please explain.:eek: Thx
  2. Claude Clay

    Claude Clay New Member

    May 26, 2009
    Central CT
    cause the softer lead bullet will expand more in the barrel thus engaging more of the lands surface.
    more friction= less velocity

    more friction also goes to higher pressure.
    less friction cause the case of a FMJ has a brinel of +35 compared to a ~12 to 18 for plated.
    even though a FMJ has more powder the pressure is not much greater cause the
    bullet is more slippery and there are more blow by gasses than a lead round.

    recover a lead or plated bullet and a FMJ
    note the deeper cuts made by the lands on the lead or plated bullet.
    the lead bullet may also expand to touch the groves and there by,
    since it can not expand any more, it lengthens.
    this deformation takes energy.
    less energy=less velocity
    also since it has sealed the expanding gasses behind it,
    the pressure remains high, unlike the FMJ which allows for blow-by gasses.
    so, once the bullet is 'sealed' the pressure remains high thus helping the bullet along.
    but a pistol is too short barreled for the gain to out weight the cost.

    there is more to this.....
    ain't there always??

    bottom line--Follow The Manual
    and cross reference. have 2 or more manuals.
    do not get creative when reloading.
    Last edited: Nov 18, 2009

  3. dsv424

    dsv424 New Member

    Oct 27, 2008
    Garland, Tx.
    Claude thanks for that enlightening bit of info. That was very helpful in understanding whats going on as different styles of bullets travel down the barrel. I really appreciate helping me understand this. Although I have six major reloading manuals and 8 of the little booklets I don't think I have every heard it explained as such. But I might need to do a "bit" more reading in the front portion of my manuals.:eek: Thanks again.
  4. TheGunClinger

    TheGunClinger Well-Known Member Supporting Member

    Read the WHOLE manual. I read it and read it and still I have questions. This forum is the best place to acquire the accumalated knowledge of experts who have been there done that.
  5. GMFWoodchuck

    GMFWoodchuck New Member

    Oct 9, 2008
    Binghamton, NY
    I still think it's to reduce bullet break up against a steel target.....
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