Hello all. In the process of cleaning and organizing my reloading room, I have come across this tool/device I cannot identify. It fits a tool head, is chambered for the neck and shoulder of 6.5 Grendel and is spring loaded for a short distance. I have a ton of Grendel brass and have had several rifles over the years. I feel like it is associated with trimming but I'm not sure. Anyone have an insight? Much appreciated yall!
