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.451 or .452, what's the difference?

Discussion in 'Handloading and Reloading' started by GSDFAN, Jan 5, 2008.


    GSDFAN Active Member

    Newbie question: I'm reloading for my .45's and it's working out pretty well so far. It's hard to find .45 bullets around here but I have noticed some in .451 and .452 diameter. What's the difference to my .45 cases? Is .452 the heavier bullet weights like 250 and 300gr? What do I need to know about this?
    Thank you.:confused:
  2. Khornet

    Khornet Well-Known Member

    Lead vs jacketed

    lead .45 bullets are usually .452, while jacketed are usually .451.
  3. nate.45

    nate.45 Member

    1/1000th of an inch.;)
  4. Walkalong

    Walkalong Moderator

    Khornet got it. Also, plated bullets are usually closer to .452.

    GSDFAN Active Member

    Ok, that makes since. Does 1/1000" affect the setting of my flare die or is it just trial and error? I have been using Hornady 230 (.451) HP/XTD, 230g FMJ (.451) encapsulated, FN, RN etc. what ever I can lay my hands on.
  6. Stinger

    Stinger Well-Known Member

    Hornady's 45 bullets that weigh over 230g are usually .452 in diameter.
  7. shc1

    shc1 Well-Known Member

    I’ve used .451 and .452 in 45 ACP, no problems at all.
    As said above it’s only 1/1000 of an inch.
    What part of VA? Might see you at the range.

    GSDFAN Active Member

    Roanoke area
  9. mike_in_md

    mike_in_md Active Member

    .452 will have more contact with the rifling in the barrel. It's the size I use for my 185 LSWC hollow points.
  10. kildar

    kildar Active Member


    What about a .45 a cast bullet measuring .453 would it have detrimental affects on accuracy in a .45 auto?
  11. NuJudge

    NuJudge Well-Known Member

    No problem with accuracy with .453", but may not chamber

    Slug your bore. If your pistol groove diameter is .451", you are about right with a .452" cast bullet.

    I have always believed that bigger is better in cast bullets, up to where they will not chamber, and the less sizing the better. The problem is that a .453" bullet in your brass may be too big in diameter to chamber freely.
  12. 1911NM

    1911NM Well-Known Member

    NuJudge is on the button. Depending on what you are shooting, ie., semi-auto, if slugging your bore comes out large enough for the .453, do you really want to shoot that diameter, or would you be better served by getting a new barrel. If you're in the wheel gun bunch, swapping barrels is not as easy so you might want to use the .453 to tighten up some sloppy groups.

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