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Thread: Reaming a 44mag barrel to 440 Cor-Bon

  1. #1
    Join Date
    Jul 2013
    Posts
    3

    Default Reaming a 44mag barrel to 440 Cor-Bon

    Is it possible to open up a 44mag DE chamber to accept 440 Cor-Bon and work with a 50ae bolt? If so is there anyone that does this work professionally?

  2. #2
    Join Date
    Jun 2014
    Location
    Austin, Texas
    Posts
    882

    Default

    I don't know.

  3. #3
    Join Date
    Jun 2014
    Location
    Upstate, South Carolina
    Posts
    794

    Default

    The .440 never caught on, rounds are stupid expensive. I don't know about the modification, I'm a little shy about playing with wall thickness on high power rounds.
    NRA Benefactor

  4. #4

    Default

    There were only a small number of these barrels made originally from Israel is what I have read... (maybe 1000?) but there were several times more barrels converted here in the states by Magnum Research, in both 6" and 10". This can be determined by the caliber designation stamp having a zero added to a 44 barrel vs a full centered stamping on the originals as well as other stamping differences I can't remember. It is well documented in many placed on the internet, so I won't try to go from memory any further.

    To answer your question, yes it not only can be done, it was done for most of the 440 barrels in existence. When I looked into doing this myself, I ran into two issues... one, making my own brass seemed like a lot of trouble, and two, the chamber would no longer be chromed. The other issue, and why the round failed in the first place, was reliability, as it head-spaces off of its angular surface, and the consistency was not met by the supplier, CorBon. The chamber reamers are still available and it can be by any competent gunbuilder... or even a good machinist, especially if you have a 50 barrel on a given firearm to match the head-spacing from.

    Maybe this round failed into obscurity, but you never know, another caliber using the same principle could pop up for the Desert Eagle ANY day. I think I will just wait and see if that happens.

    MrBlackCat

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