Poss .410 Musket round Identification

I am trying to identify this cartridge for someone here are a few photos and some dimensions, I think it may be a homemade or early .410 Indian musket round but dimensions a little short.

Dimensions as given to me
Total length 53.5mm.
Base diameter 13.8mm.
Cartridge base diameter 12.1mm.
Neck diameter 11.3mm.
Bullet diameter 10.3mm.

many thanks
Richard.