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Thread: Mystery 25mm

  1. #1
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    Mystery 25mm

    I've never managed to get a positive ID for this one.

    25mm calibre
    11mm wide driving band
    26.45mm diameter measured over the driving band
    127.82mm length
    36.45mm distance from the rear of the driving band to the rear of the projectile

    There looks to be the remains of propellant residue to the rear of the band. No stamping at all on the projectile.

    I'm wondering if its from a combustible caseless round

    Does anyone have any ideas?

    Dave.
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    Last edited by SG500; 25th May 2014 at 08:34 PM.

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    rcaf53 (27th May 2014)

  3. #2
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    Maybe a telescoped round?

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    SG500 (26th May 2014)

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    rcaf53 (27th May 2014), SG500 (26th May 2014)

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    Quote Originally Posted by bdgreen View Post
    Hi bdgreen a great link thank you. My wants list just got longer.
    Dave.

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    Just an update on this one. I got this projectile in a cut down 20 x 139 case, it now measures 25 x 95.
    I didn't post the photo of the case earlier as I had assumed someone had made it up.
    Having send photos to a very well respected collector he has a similar one and a note "prob. test vehicle for caseless".
    So.......this may answer the question I never asked, is the 25 x 95 case that came with the projectile correct........it seems it probably is.
    But the question still remains, what does the caseless round look like. Perhaps bdgreen is right or perhaps its something else.
    Anyone else got any ideas?
    Dave.

    IMG_7379.jpgIMG_7380.jpgIMG_7381.jpgIMG_7382.jpg

  9. #6
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    The F-15 Eagle was supposed to have a caseless 25mm, so could it be a prototype or test round for that?

  10. #7
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    Quote Originally Posted by Spaceinvader View Post
    The F-15 Eagle was supposed to have a caseless 25mm, so could it be a prototype or test round for that?
    I doubt it, as the GAU-7/A round had a very different projectile (see below).


    23x146SR (US Cal. .90 inch T1 experimental), 23x139RB (US Cal. .90 inch T2 experimental), 23x139RB (US Cal. .90 inch T3 & T4 experimental), 23x122 (HS.406/407: French aircraft gun 1940),24x138B German WW2 (replica), 27x70B (for 1950s large-calibre Vulcan M61 variant), 25x116B (Oerlikon 251/25 RK aircraft gun),26x130 (Colt 1960s AFV gun), 25x152 case and projectile (from US GAU-7 cannon 1960s - contained within combustible case),25x145 (US plastic-cased)

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    hasag (28th March 2020)

  12. #8
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    Ahh okay, just thought there could be a chance. Im stumped!

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    hasag (28th March 2020)

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    Hi Dave
    That's given me a boost, its the drive band and tail length that made me curios in the beginning, its another mystery to solve (there's plenty of time now
































































    Hi Dave, that's given me a boost and yet another mystery to try and solve, it was the drive band and tail that grabbed my attention when I bought it, the paint is original but not 100% sure on the black tip, its obviously a tp projectile (no need for a black tip)
    The project goes on
    Stay safe
    Mick

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    hasag (28th March 2020)

  16. #10
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    Hello, I have this one with original paint and French manufacture it seems the same, I do not know the use and model.




    IMG_6806.jpgIMG_6805.jpg

    Last edited by hasag; 28th March 2020 at 07:25 PM.

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    MINENAZ16 (29th March 2020)

 

 
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