That is really Cool. Looks to be for one of those English cap-and-ball revolvers; Adams or Kerr or something.
The boolits had a greased felt wad attached to the base, held on by that prong. You can sometimes see a few such assemblies in one of the compartments of the pistol boxes. You might check the British Militaria site for examples.
Now that's neat.
Do you have the shootin iron for those?
No pistol. Just the mold
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 |