Collath cartridges originated during the first years of the 20th century and were loaded with soft points bullets.
According to me they were loaded with smokeless powders

I have a loading data only ( handloader's manual of cartridge conversions,J.J. Donnelly)

Lead bullet - .424" / 305 grains
41,3 grains of IMR3031 , using cases formed from 45 Basic brass

Handloading forum guys would probably be more helpful than me