As a cartridge collector, I am interested in the calibers of August O. Zischang marked rifles.  In my collection, I have four cartridges that I bought several years ago that are identified as Zischang cartridges. Three of these (25-20 Zischang, .28-25 Zischang, and .30-30 Zischang) were made from .32 Ideal cases. The fourth (.30-35 Zischang) appears to have been made using a .32-35 Maynard or Stevens case. I have included a picture below of the four cartridges, in the same order as listed above. The cartridges are also pictured with dimensions on my web page
at: http://www.oldammo.com/pictures.htm
I have not found much on Zischang and nothing on his cartridges in my reference books or on the internet. I'm looking for any information on these cartridges and any others that may have been designed by Zischang. Thanks.