.451 or .452 ?

Discussion in 'The Ammo & Reloading Forum' started by Mac0083, Sep 10, 2009.

  1. Mac0083

    Mac0083 New Member

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    when you pickup a box of .45acp FMJ from wally world, are they loaded with 451 or 452? If I understand correctly, 452 is for cast lead boolits, and 451 is factory FMJ bullets.

    Same question for .40S&W, 9mm and 38spl. Thanks for the help gentlemen.
  2. Insulation Tim

    Insulation Tim Well-Known Member Supporting Member

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    What exactly is the question?
  3. woolleyworm

    woolleyworm Active Member

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    The FMJ bullets will have a .451 diameter in 45acp. Your statement on jacketed vs lead is correct. Lead bullets will typically be +.001 in diameter in most calibers.
    Last edited: Sep 10, 2009
  4. JLA

    JLA Well-Known Member

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    ALL factory loaded .45 ACP ammo is loaded with .451 bullets. Most cast lead .45 cal bullets including .45 ACP are cast .452. I have used them as cast without probs but some loading manuals suggest sizing to .451 for best results...
  5. DWARREN123

    DWARREN123 New Member

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    40 &W is .400 in jacketed and .401 in lead, same diameter for the 10mm.
  6. gdmoody

    gdmoody Moderator Supporting Member

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    .38 special is .358 in lead or .357 in jacketed.

    .380 and 9mm are .355 in everything.
  7. dardascastbullets

    dardascastbullets New Member

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    Hi Mac,

    Actually, the sized diameter for cast bullets from commercial bullet manufacturers varies. Some manufacturers size to 0.452", while others size to other fixed diameters. So that all possible bore diameters can be accounted for, we size to the customers' requirements:.451", .452", .453", and .454". The reloader can then determine which diameter they require and receive the correct bullet diameter.

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