Wick Winchester 1894 Dart Blaster Shell

While you can cheaply order more shells from Ali Express these can just be self printed. They miss the rubber at the bottom and are a little shorter but i didnt see any worse performance.

Them being slightly shorter than the original leads to better ejection and less being stuck in my experience too. 

Perhaps you can take this as base in case you want to add engravings to shells or any other details