12ga, 10ga, 8ga, 4ga FH; 585HE, 700HE; Big Bores--

Discussion in 'Double Rifles' started by hubel458, Dec 2, 2011.

  1. hubel458

    hubel458 AH Senior Member

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    Here is picture of 24ga FH in the Mossberg bolt gun. On a
    Mossy 390 frame, .585" heavy barrel, same as 24ga size.
    Chamber is set up 3" with shotgun style forcing cone,
    so it can use 2.5" plastic cases and 2.5" Magtech brass
    cases with slugs or shot and for 3" cases we use 577NE
    3" brass. Really make a hairy 24ga using the 440gr to
    540 gr Minie bullets at 21-2400. If you take 540 Minie bullet
    mould and leave out base pin you'd have a 650gr that
    would do. All these bullets and slugs as well as jacketed and
    turned 577/585 bullets work in 24ga as well as my 585HE.
    And the smaller Minies work in our 12ga sabots. I keep
    saying 58cal is where it is at, and there are more bullet and
    slug choices in the .585 size, easy to find, than any other
    caliber over 458. And Minies are like 40 cents each and
    cheaper if you cast your own.

    [​IMG]


    Here is picture .585" barrels from McGowen, with other barrels.
    Most of the McGowens profiled and some straight blanks.
    Others we have are the slow twist and smooth blanks...
    In back some of the cases and die sets.

    [​IMG]

    Here is picture of an Enfield and a BBK in Hogue recoil
    reducing stocks. These stocks are the rubber coated ones with
    the easy to grip, nice pistol grip.Has McGowen 26 inch barrels,
    1 to 20 twist, barrels are heavy profile and taper
    to .980 inch at the muzzle. Guys are doing more Enfields
    and other actions through the winter. Ed

    [​IMG]

    Attached Files:

  2. hubel458

    hubel458 AH Senior Member

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    Some guys in 12ga like to use the Magtech brass cases
    but the cases being brass the sides are thinner than
    plastic, and that makes loose fit in 12ga chambers.
    And cases expand a lot with heavier loaded slug
    loads, are harder to resize, wear out quicker.
    But I found that .750 hollowbase 10ga slug fits
    those cases and still chambers in regular 12ga.
    chamber, it isnt a sloppy fit.

    So If you have a 12ga smooth barrel with full length
    backbore job, of .850" bore or bigger you could use
    the Magtech brass and .850" size 10ga hollowbase slugs.
    Now these .850" slugs won't go in a 12ga plastic case
    and chamber in regular 12ga chamber.And you do not
    fire them through 12ga regular size barrel.

    Brett in MN used the a BPI AQ slugs in his full length
    backbored 12ga and got fair accuracy as he said the wads
    under slugs expanded a lot for a decent fit.
    The 10ga slug shown in the 2.5 inch Magtech is 800 gr,
    and .850" diameter. These cases will take magnum
    pressure so you can get good speed, for what this short
    case can hold.

    It is too bad they don't make 3" and 3.5" versions.
    These 2.5" cases are easier to find and much less than
    others, so if needing brass ones you can rig up guns
    to work with them. To build a new barreled gun in actual
    12ga size, IE .729" bore, you'd make chamber to
    minimum specs so cases don't over expand.
    In the picture are 2 10ga slugs on right, like in the case,
    and 2 12ga jacketed slugs and one 12ga lead slug left.ED


    [​IMG]



    Here is the ytube URL again for our guy
    shooting 585HE in his NEF----By mid summer we plan on a
    pickup truck load of more 585HE cases coming in.

    Attached Files:

    Last edited by a moderator: Apr 28, 2014
  3. hubel458

    hubel458 AH Senior Member

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    Here is good simple system with big hollowbase slugs to stop
    the skirts from deforming, I found that dense dow foam works
    good, I was using glue gun but dow foam is easier, Just cut
    plugs out of foam sheet and force into the base. Make a tight
    fit, use spot of glue inside, glue that is for foam....
    Trim off the foam flush..In picture is 10 ga 900gr slug.

    [​IMG]

    How we get good 24ga plastic seals with protusion on
    top that fits up inside 58cal Minie base, same bore as 24ga
    and our 585HE. I get the 24ga seal by cutting apart the BPI
    24ga Brush wad, getting two seals out of each.Works great
    in plastic case giving a shorter column than other seals and
    wads, so we can get in enough of our 4759 for good speed.
    The 24ga idea is getting nicer all the time with
    the variety of cheap 58cal slugs, and good 3" brass cases,
    drawn cases, we didn't have to wait to get made.
    And all kind of guns we can use, bolt 395 Mossbergs, single
    shots of all kinds, Autos,, pumps. bolt action Savage,
    even 1887 Win and Greener MKIII, bolt action JC Higgins. .

    [​IMG]

    Here is picture Khan auto we setting up 24ga FH, it is 3.5"
    model, has a 12ga barrel to change with. Being 3.5" it
    feeds/ejects through lengthened port 3" brass 24ga cases we
    made from 577NE brass. We rework back of the bolt for
    slightly longer stroke.Ed

    [​IMG]

    Attached Files:

  4. hubel458

    hubel458 AH Senior Member

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    Here is picture of 24ga cases, loads; and some slugs and seals.
    Brass cases are 3", plastic cases are 2.5". Brass 3" can be loaded
    to match 577NE power.

    View attachment 24galoads.jpg

    Here is of 24ga in an 87 Win, just test gun of mine. Uses same barrels
    as our 585HE, This one has slow twist for Minie bullets.Our guys
    have got supply of regular and slow twist barrels.

    View attachment 87-24ga.jpg

    Here is picture of the first 585HE done and shooting in Australia.
    It is owned by the poster, 'tankhunter' on the AR forums.
    Built by his smith who has a reamer.
    Guys there can get cases from Bertram, and there will soon be three
    reamers there. There is a company there now making 585 barrels,
    Allan and Grant Swan. in Redbank, Queensland.....Ed

    View attachment tankhunter.jpg

    PS---WE need guys in SA to get a barrel of 585HE cases(group buy maybe) from Bertram and see who can be the first there with a gun done
    and shooting. Does SA have reamer builder
    who isn't stacked up with work for years.

    Attached Files:

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