this was a great find fuhrmann!
ok, the 24 ga here used was a very ligth load. 15,1mm long, 21,9 gramm cats head with 2,5 gramm (38,5 grain!!!!!)rifle blackpowder. the ballistic is what we think, only 342 m/sec

the 24 ga RWS cats head was 18,70mm long, weight 33,3gramm. obviously that there are different weight's around:

the first 3 bullets in this pic are all 20 ga

I have here camber cast's from 3 different guns

28/50 cartridge, Husqvarna Mod 17 A

24/40 cape gun, Funk /Suhl

20/40 heavy target rifle with Mauser M 71 action

all have a mark at 40mm to show the end of the case in the chamber. the husqvarna have a chamber for a 50mm long case and the 20 bore have a lot of freebore till rifling starts. the rifling in the Funk 24 ga starts immediate when the case ends. its clear that you can only load a cartridge with a bullet completely in the case. you get more than 38,5 grains in the case. I think that there is enough place for 70 grain BP in such a combination.( like the 577 snyder! a cartridge that take all game in its time including elephant in india) this funk cape gun is a very light one, maybe it was only build for light roe deer loads.