Got this in a box of reloading stuff. Never seen something like it. The spring loaded pin seems to be for setting a primer maybe??? Removable brass insert for??? Ideas???
https://flic.kr/p/2oBTqvG
https://flic.kr/p/2oBNuzf
https://flic.kr/p/2oBRtGw
https://flic.kr/p/2oBTMPb
https://flic.kr/p/2oBTMKd
https://flic.kr/p/2oBTqqM