Johann

I send mehul some pics from old catalogs, hope he can post it here next time.
original rounds will be very expensive if you find it, I know some members of the ECRA but think you want get it under 100 euro per round if on hand.
Do you load for the gun?
Original bullet weigth was 435grain with the tesco KUPFER-Nickelmantel Geschoss with a.506 dia. at the driving bands. this bullet was a special collath development to hold pressure down with nitro in old blackpowder guns.
Maybe a good idea to talk with Delsing in germany, he make fine and inexpensive softpoints on demand.
But I wouldnt order anything without a chamber cast and slug the bore for rigth diameter.
Brass? many will take 3,25" long 500 Nitro brass, there are only 3,3mm from 82,5mm to 86mm.
Make a try with Horneber, what I know Horneber is making also the brass for the blackpowder express ammo from Waffen- Dorfner in Wien and he is allways willing to help if you are willing to wait some time.
Its like stone age now but Nonte "cartridge Conversions" comes back in mind and his method of spinning a case to greater length.
Thats seems no witchcraft to make 3,5mm with this.