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Thread: 4 Bore Single Shot Action

  1. #1
    Boolit Grand Master



    missionary5155's Avatar
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    4 Bore Single Shot Action

    Greetings
    Bought 3 of the 4 bore brass casings that were offered for sale. Now need a single shot to use them loaded with BP.
    It may more be cost effective just to have one built. So the thought crossed my mind wondering if there is an existing action already out there large enough to have a 4 bore barrel screwed on it. Would be a smooth bore.
    I have read a rolling block was used but I cannot verify that notation. If so I have several that I would happily rebarrel.

    I do know the brass has a 1.038 outside diameter. Rim diameter I would assume is going to be at least 1.060 or so. Length is 4 inches.
    So my question is... What is the outside diameter of a #1 Roller ?
    If you have any other make of single action what is the outside diameter ?
    I would think an action is going to need to be a minimum of 1.5 inches wide. The wider the better.
    In my reading most of the old single 4 Bores were about 17 pounds with 24 inch barrels.
    So if you can measure any action easy to get to I would appreciate it. This is not a time wise emergency. I have until June 2020 to get this figured out.
    Thank you ! Mike in Peru
    "Come unto Me, all you who labor and are heavy burdened, and I will give you rest." Matthew 11:28
    Male Guanaco out in dry lakebed at 10,800 feet south of Arequipa.

  2. #2
    Boolit Buddy
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    I do think that for a four bore, you will be making an action.
    There may be some whaling guns that could serve but they are rare and expensive in their own right.

  3. #3
    Boolit Master
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    Try looking on the nitroexpress.com forum a lot of the members play around with the big bores. Frank

  4. #4
    Boolit Master
    NoZombies's Avatar
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    Do you care how historic it looks?

    The VZ-85 26.5mm might be an answer for you if you aren't after the historic look.
    Nozombies.com Practical Zombie Survival

    Collecting .32 molds. Please let me know if you have one you don't need, cause I might "need" it!

  5. #5
    Boolit Grand Master



    missionary5155's Avatar
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    Thank you ! I will look at that site and the VZ rifle.
    "Come unto Me, all you who labor and are heavy burdened, and I will give you rest." Matthew 11:28
    Male Guanaco out in dry lakebed at 10,800 feet south of Arequipa.

  6. #6
    Boolit Master



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    Maybe a Greener Martini action or possibly regular Martini Henry action.

    Bob
    GUNFIRE! The sound of Freedom!

  7. #7
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    There is the Russian Tula 4 gauge shotgun. You might also look into a Punt Gun, I'm not sure if they were all muzzle loaders, or if some were breach loaders.
    4 more brass can be made by turning the base down on 20mm Vulcan brass. I made a couple for my WW1 German flare gun.

  8. #8
    Boolit Grand Master



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    Howdy Lar45
    Thank you for that info. I will look into that Tula 4 gauge.
    "Come unto Me, all you who labor and are heavy burdened, and I will give you rest." Matthew 11:28
    Male Guanaco out in dry lakebed at 10,800 feet south of Arequipa.

  9. #9
    Boolit Master Nobade's Avatar
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    Give a call to Stolzer and sons Gunsmithing. He has built several. Probably be able to find him on YouTube also.
    "Quemadmoeum gladis nemeinum occidit, occidentis telum est."

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check