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Thread: 12GA FH--Hairy Shotgun/Rifle--

  1. #161
    Happy Camper hcpookie's Avatar
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    Check this out - a Mosin Nagant styled bolt in 12 gauge! I say "styled" because the description indicates it used the Mosin design for some signalling/launching device but doesn't give particulars.

    I suppose the question is would a Mosin receiver have the strength to hanlde 12GFH? Since the 7.62x54R is published to pressures of 50,000 CUP I would think it is, considering the other bolt actions that have been converted?



    This bolt was used in a European mounted type device that used a 12 Ga. shotshell to propel weather balloons. Although the device uses a Mosin Nagant style bolt, it is not related in any way to the standard Mosin Nagant series rifles. Quantities are very limited.
    Mosin Nagant 12 Ga. Shotshell Bolt Assembly | e-GunParts.com

    Neat, huh?

  2. #162
    Gunco Member hubel458's Avatar
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    Yes the Mosin ok for shotgun loads, it wouldn't
    take real long cases.Handle 15,000 psi plastic case loads.ED

  3. #163
    Gunco Member hubel458's Avatar
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    Matthew in Oregon got the 12GA FH Savage.
    He is now in the recoil club.

    Here is picture of the 12ga belted cases I made to
    test a few loads in. I made it from 55cal belted
    Boys case. I reduced belt diameter a little and left
    the base the same, which is 12ga size.In picture
    first is 55cal, second expanded to .620", third
    expanded to .660"(16ga), then two 12 ga ones.
    Next is our 12GA FH, and then a 12ga 3.5"
    plastic case.A little work in long 12ga FH chamber
    with a tool for belt step and it chambers. Ed


  4. #164
    Gunco Member hubel458's Avatar
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    Here is a picture of US-S brass slug after going through
    3 foot of wood slabs in a bundle. It has shed its plastic
    base and it went through straight without tumbling.
    This one is 570 gr fired at 2200 in RMC case, from NEF.
    Also in picture is one with white sabot petals off, as it
    would be in flight, before hitting target.Ed


  5. #165
    Happy Camper hcpookie's Avatar
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    That's impressive! Not much expansion, although as I type this I suppose that doesn't NEED much expansion, does it?


    A question for you Ed,

    I'm building my cases and as I've said I'm going with inserts to use with shotgun primers. From what I've been reading it seems as if the 7383 powder is a good starting point. Would you use 10g of starter powder with 7383?

    Also a question about inserts:

    With shotgun primers, do you need the insert to cover the inside tip of the shotgun primer to make a flash hole like the BMG primers use? Or is it OK to complete drill out and use like a normal shotgun primer? The reason I ask is I don't know how the pressure will be affected if the insert is all-open vs. flash hole

  6. #166
    Gunco Member hubel458's Avatar
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    I have cases with inserts drilled all the way through just like regular
    12ga cases and like RMC brass cases.I drill all the way through and
    thread it and put in insert and drill it through. The shotgun primer
    battery cup has its own flashhole. You don't need any starter powder
    with surplus 7383. Or RE17 which is better yet, as it is a little faster.
    On all slug/sabots must use a good proper roll crimp for dependable
    ignition.

    Could you show pictures of your case building process.
    And do a description of it for the folks.

    4bore work. Working on design of firing pin,
    and waiting for parts now. Problem is getting
    real small parts without CNC for bushed
    firing pin with rebound spring. But it takes
    time.

    We will have swaged lead slugs
    in a little while as my barrel is smooth. They
    will be 1600gr hollowbase, when done,
    a hundred of them at least.
    Got wads and cards, shown in the picture with 4bore
    cases and slugs. And my 2bore case for comparison
    Also 12ga wads for comparison..Ed


  7. #167
    Gunco Member hubel458's Avatar
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    Our cartridge work and experimenting got a nice
    write up in # 470 Nov/Dec International Ammunition
    Journal. Page 10-11 by Zach Weighman, a
    cartridge collector and gun nut friend.

    Got a guy just figured out BMG case rim, and for a rim
    puts on 12ga high base cup from a plastic case. He turns
    base/rim of bmg case about .008" and use JB Kwik to hold
    it on. Pushes it on with press. He removes base cup with
    heat gun from plastic cases,

    He is using RE17, so shotgun primers will work, and he
    puts bushing in case for primer. Has bushing reamed so
    the primer pocket protrusion on the base cup goes up inside
    tight, as he pushes on the base cup. It'll fire ok and to size it
    do like I do, I push case into open top die, and push it
    back out from the top with a rod and hammer. That
    way the rim don't get bent up. He says it saves a lot of
    time not having to make rim pieces.

    We will have more info and pictures next few weeks.Ed

  8. #168
    Gunco Member hubel458's Avatar
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    Here is a picture of a BPI sabot with a BPI Flexseal I
    use on to it in place of the original cushion seal.
    I also cut shallow slots in the outside at the bottom
    of the petals. Sabot opens much quicker and seems
    along with BPGS seals under it to work ok without
    damage, giving high velocities. In pic on left is regular
    BPI sabot, behind is one I put a cushion on from a
    Brenekke KO slug, and in front the one with Flexseal on.
    The slug in it is one a guy casts at 440 gr and .504"
    diameter, and works ok.

    New info on my 499HE, from now on we will make cases
    out of 450 #2 brass, as Jamisons has 3-4000 cases,
    and it seems no one has the 475 #2 we used first.
    Only slight case dimension change is the base .012"
    smaller, all else is the same. I'm getting reamers redone
    and will be able to use in couple weeks. Case will still have
    plenty of taper to extract easy in singles, doubles,
    falling blocks.etc.

    And speaking of falling blocks I found one, and put my 585HE
    in it, and it is big enough and has enough clearance to be used
    for a 577NE, 600NE, long 20ga, my long 16ga FH,
    the 700H, the 700HE. Cost no more than Ruger, with barrel
    figured in. Will have pics
    and info soon. Ed


  9. #169
    Gunco Member hubel458's Avatar
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    Here is picture, Falling Block I found that I put
    my 585HE in. It didn't need any work on the
    feed trough to feed. 585 case shown in it.
    In fact the trough is big enough
    and the action big enough for 600NE, 3.5" 20ga
    brass, 3.5" 16ga FH brass, my 700 HE long case.
    I reworked a NEF stock to it, as I'm not
    a stockmaker.Nice action.2nd picture is
    of the 16GA FH in the feed trough.Ed




  10. #170
    Gunco Member hubel458's Avatar
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    Here is picture of the FBW falling block with my
    700HE long case in it.This falling block is 1.5"
    wide, with a 1.125" wide breach block.
    The sides are .187" thick next to breach block.
    This compares to about .165" say for a Browning
    B-87, Win copy. The feed trough would work with
    12ga size rim if some work was done on the top
    of the hammer. This has a barrel thread length of
    1.005", thread diameter of 1.125" for good
    strength. Ed


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