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Thread: 7.8x78 cartridge

  1. 03-13-2023, 09:39 AM #1
    Cowboy32
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    7.8x78 cartridge

    I just picked up a German O/U Cape gun in 16 ga. and what is marked on the rifle barrel as a 7.8/78mm. I did a chamber cast and it is a 78mm long slender, tapered cartridge. I cannot find out much about it. I'll try to post pictures later. Anyone ever run into such a cartridge?
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  2. 03-13-2023, 10:47 AM #2
    Good Cheer
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    By any chance does the back end of the chamber have the same dimensions as a 9.3x74R? If so and you were to full length size 9.3x74R brass you would pick up a little length.
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  3. 03-13-2023, 10:59 AM #3
    Cowboy32
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    The rim dimension on my barrel is .517. I'm not following. I understand the lengthening. How would that reduce the neck down to 7.8mm? I have no idea what dies to get for it.
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  4. 03-13-2023, 11:34 AM #4
    centershot
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    Try Huntington Die Specialties or a die set, no doubt it'll be a special order item but they'll make most anything.
    "We take a thousand moments for granted thinking there will be a thousand more to come. Each day, each breath, each beat of your heart is a gift. Live with love & joy, tomorrow is not promised to anyone......"

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  5. 03-13-2023, 12:28 PM #5
    Good Cheer
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    Measuring a RWS 9.3 case I'm getting a 0.522" rim and 0.463" on the body ahead of the rim.
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  6. 03-13-2023, 12:40 PM #6
    SOFMatchstaff
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    Sounds like the bore would take the .318 dia J bore 8mm bullet. the case length sounds like its gonna be problem....
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  7. 03-13-2023, 01:45 PM #7
    Cowboy32
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    Yes, .318 would be right for the bore.
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  8. 03-13-2023, 02:31 PM #8
    17nut
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    The best Quickload would do is 8x75R
    The creator is german so if they existed he'd include them.

    https://imgur.com/a/JlXJUGF
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  9. 03-13-2023, 02:37 PM #9
    17nut
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    I know that the 8,15x46R cartrigde has a way long leade and maybe this one has one too, and that might fool you?
    These old BP cartridges has typically a very roomy threoat/leade to accomodate for BP fouling.
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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