Joyce F4 No. 25 Percussion Caps

[Micheal Doyne]

Attachment 112081

Any ideas on what these Joyce No24 percussion caps are for, I have a couple of thousand in 100 and 250 sealed tins. The came as a surprise with a job lot of boxed de primed .303 Mk7 cases, just shoved in a couple of the 32 rnd Mk7 boxes. I am a little loath to un seal them, and the google had let me down so far, only reference is someone saying they can use them in their P53 repro but they don’t really fit.

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[browningautorifle]

Here's a bit of a read for you. More info. Number 25 percussion caps?? | Muzzle Loading Forum

Perhaps they fit something obsolete like a Brown Bess cap conversion? That would have been big...