I'm trying to identify a cartridge

I recently bought a cape gun. Made in Belgium. Made a sulfur cast of the chamber. The dimensions follow in inches:
length = 1.41 35.8mm
cal = .43
neck of cartridge = .457
base of cartridge = .475
rim diameter = .535
rim thickness = .073

I went through the Manual for cartridge conversions but found nothing really close to the measurements. Any and all help is appreciated.