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Thread: 12 GA From Hell

  1. #21
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    I took couple of my flat nose
    Bridger 750 gr solid banded hollowbase bullet
    and shortened the nose. Actually made
    a slightly rounded
    nose solid of 500 gr. With hollowbase it was still
    a decent length, at one inch.I got it over
    2800 fps, at my moderate pressures.Just doing
    experimenting. Everyone got designs and wants
    their ideas for slugs tested, so we do it.Ed.

  2. #22
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    I have figured out that all bullets for 500 S&W
    will fit in the sabot Barnes uses in the
    3/4 oz sabot load that Federal sells.That is the sabot load I got up to high speed in the Savage. Lighter 505 bullets will work also. And the front section of a 50 bmg bore rider
    bullet, it is 2nd in picture in the sabot. It
    is 470 grains, really streamlined.And
    you can buy them by the ton, and just cut back
    portion that is .510 diameter, off, and that leaves front part for a .500 dia bullet,
    1.5 inches long..Good for armor plated chucks?? First in picture is original
    sabot with Barnes 3/4 oz hollowpoint slug...3rd is the 900gr 600NE slug in my sabot made
    from heavy shotcup. Shot it at 2300 fps. 4th on the miniature digital scale is an older Barnes
    .580 cal saboted slug expanded, it's 435gr. Ed.


  3. #23
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    ok.I admit it too.Way too much gun for me.But very interesting.

    Allen

  4. #24
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    Shot a 610 grain hollowpoint Dixie hard
    slug into 6 gallon sealed pail of water.
    Going 2800 fps, and real big hollowpoint.
    First pic is pail with crimped on top.
    Pail full and has filler spout capped.
    Second pic,impact with water atomising,
    and pail blowing apart.In the next small
    fraction of a second is third after impact
    with shelf cleared, the hyrostatic pressure
    down, has bent top of steel frame shelf.
    Same blast put jug pieces all over.
    Got to get a 15 gallon one. Behind
    you see my wood bundle backstop...Ed






  5. #25
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    O.O OW too much gun for me.

    in Oregon you can have a 50 cal BMG as long as its registered and only has 10 round magazine max

  6. #26
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    NO SIR!
    I think I like my shoulder WAY too much to do that to myself...

    My 300 Win mag was too much for me after 10 rounds in the same session. That thing would be 10 rounds to the 10th power!!

    Nice toys though.

    Doug.

  7. #27
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    I picked up a 12ga NEF Ultra Slug gun.
    With 24 inch shorty barrel.
    Added weight and thumbhole stock.
    Gun weighted to 15 lbs so
    far. I got 600gr hard slug to
    1650-1700 so far, and shoots easy.
    Got 1 1/2 inch thick pad.Working up different
    loads.Should get over 2000.
    Cases eject easy,no resizing needed
    on bottom half of case,action opens easy,
    no evidence of binding.Started case 3.2 inch,
    settled on case length of 3.15-- Chamber being
    full size max 12ga size expands top half of case
    more than my minimum chamber in Savage does,
    so little more effort needed to size.Our case, though many times stronger than regular
    12ga cases is thinner at mouth, so that is
    why I used tight chamber on Savage.Still
    can't get used to mickey mouse short barrel.
    Anyone know of a genius who could
    make long alloy barrel with pivot mounted?
    Cases can be 3 inches on up to
    our length, and work.Ed


  8. #28
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    We got 600 gr slug to 2000 fps in NEF.Used ball
    powder load. Case length of maximum 3.07 works.
    Can use our case shorter, but load developement harder.
    Anyone using our style case should also put in adapter
    for shotgun primer. Save a lot of work
    beefing up hammer speed and strength.Ed

  9. #29
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    Being some guns need to much work
    to fire bmg primers, it easier to
    do the following with adapter bushings.
    Here is picture of cases for primer
    comparisons.1st is regular bmg
    primer. 2nd is adapted to a shotgun primer.
    3rd is adapted to large rifle primer.
    Of the 2 adaptations, large rifle is
    easier to do, just ream out pocket, thread in adapter, but adapting shotgun primer
    you have to deepen the original primer
    pocket a little, then thread and screw in
    a bushing.These two primers give about
    100 fps less than bmg primer.Ed.


  10. #30
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    Testing RL-25 in Savage, with long case--Got 730 gr
    hardened cast slug to 2400 plus with 300 gr RL-25.
    Full load. Bottom of cases don't need sizing.Ed

  11. #31
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    We are having a group buy of 1000 gr soft jacketed
    bullets for 12ga from Hawk. $2.10 each.Contact
    me for details.Need order of 1000 total for them to make dies and start.Got commitment for 400
    already.Let me know if interested.We are getting a replica 1887 12ga lever gun to test our cases in.Ed.

  12. #32
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    Got some recoil now, shot a couple 1050
    gr Bridger slugs in Savage , got over
    2200 fps.Ed

  13. #33
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    Getting into really hairy fun now.
    Rob shot a few 1000 grain Bridgers at 3250 fps
    and he said he couldn't go any higher as recoil
    was "severe". His Borchardt is 24 lbs, and can take
    any pressure you could load for it and still
    hang on. Cartridges of this size really gets
    the juices flowing at over 23,000 ft lbs..Ed

  14. #34
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    Here is pic of the 1887 replica 12ga
    levergun we are testing brass cases in. Ed


  15. #35
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    I got Rocky Mtn turned 12ga cases, and am
    developing loads. They are 2 7/8 inches
    long are for use in NEF and shortened
    in 1887. These cases have shotgun
    primers. Now these cases with shotgun primers and the two cases of ours we put small primers in don't fire the slow rifle powder loads
    reliably,like cases with bmg primers.
    Our testing is with 600 hardened Dixie slugs.
    So I have and am testing slow shotgun powder and fast rifle.I tested 5 shotgun powders and
    the primers fires then ok but the quick peak pressure when loads increased to get velocity
    wanted in NEF caused too much case expansion just ahead of the base.Cases ejected ok but
    that expansion and resizing will ruin cases
    in a couple shots.These cases have a real thick base, and are machined to glass smooth finish.Nice cases.
    I now testing AA1680 Ball and it looks good.
    Have got loads up to 105 gr with 2 wads in
    the Rocky Mtn case, and only .002 expansion
    of case ahead of base. Will chrono next and
    expect it to get velocity we want in NEF.
    Nice thing about this testing is that same loads will work in shortened 87 case by just
    using less wad column.Ed

  16. #36
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    ... the quick peak pressure ...

    It's not the quick pressure but the peak pressure that is your problem. Slower powder will help but remember that shotguns are designed for chamber pressures in the 15,000 psi and less range.

  17. #37
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    GGaskill-With our heavy alloy barrels we
    can run more pressures. Up to 40k psi in
    Savage with 3 bolt lugs. Up to 25k with
    NEF due to heavy alloy barrel. The difference is the shape of the pressure curve as I
    discovered testing thousands of big bor straight cases.And the powders getting to sharp peak pressures in about half the time that other powders that get to a more rounded later peak
    always have expanded cases much more ahead of the base.Case in point here -600 gr slug--24 barrel-
    using NEF---45 gr of bluedot expanded
    brass ahead of base .008, about 15k psi(not good
    having to work brass that much)--
    compared to 120 gr AA1680, brass expanded .002
    about 25k, later time to peak pressure, huge more
    amount under the pressure curve.Notice more
    pressure, and had more velocity, 1/4 the
    expansion.These are turned cases much more
    sensitive to firing than the ones we made from
    bmg brass.Ed

  18. #38
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    Got the NEF chambered for long case. And remember it
    has beefed up hammer for bmg primers used in our case.
    Got 2500 fps with 600 gr slug, cases eject out real easy,
    8300 ft lbs from an NEF with 24 inch barrel.If you set up
    NEF to use regular primers adapted to our case or
    have Rocky Mtn make a long case you can do it without
    a lot of work on the hammer and springs. Just use a
    flake shotgun powder as a starter powder above the
    primer, which how 700 NE and others are loaded.
    Use 10 gr of flake and cut regular load 40 gr and
    work up if pressures allow.Ed.

  19. #39
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    Be nice to know what all the abbreviations meant

    John

  20. #40
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    NEF--New England Firearms (successor to Harrington & Richardson)
    bmg--Browning Machine Gun (.50 cal.)
    NE--nitro express (old time British African hunting cartridges)


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