Identify this mould?

[Widows Son]

Along with my Whitworth was included some miscellaneous accessories, including 1 of these hexagonal bullets with a cupped base. It measures .441 flat to flat, .466 corner to corner and the bottom cup is .143 deep.
I expect it was intended for paper patching because it would probably fall down a clean bore.
Thank you for your consideration.

 

[Bob Troxell]

Along with my Whitworth was included some miscellaneous accessories, including 1 of these hexagonal bullets with a cupped base. It measures .441 flat to flat, .466 corner to corner and the bottom cup is .143 deep.
I expect it was intended for paper patching because it would probably fall down a clean bore.
Thank you for your consideration.

I am just now learning about the Whitworth rifle and the hex bullets that they fire.
I have learned that cylindrical bullets can be fired through hexagonal rifled bores and that as a part of the paper cartridge making process, cylindrical bullets are indeed “paper patched”.
I am not so sure about the hexagonal bullets being paper patched.
I have also learned that paper patched cylindrical bullets will slide down the bore with only the weight of the ram rod applied.
I can only guess that hexagonal bullets would be loaded the same way.
I suspect that the one hexagonal bullet that you have can be paper patched with very thin rag paper being careful to patch it so that it easily slides down the bore.