The present disclosure relates to a cartridge case processing device, comprising: a trimmer holder comprising a first section that receives a die body and a second section provided with a through hole that receives a rotatably mounted rod upon which a cutter is arranged; and an adjusting device positioned coaxial to the rod and comprising a hollow cylindrical component provided with a threaded section that extends at least partially into the second section and engages with an internal threaded section of the second section, the hollow cylindrical component being rotatable relative to the trimmer holder, the adjusting device comprising an operating section for manual rotation of the hollow cylindrical component in relation to the trimmer holder.