Thankyou all ya legends- I discovered I have a tap set :) think the only reason I bought it is for stuck cases.... bought some m6 bolts- did the trick.
32 years reloading- this is my 4th stuck case- I usually destroy the case getting it out and mark the die inside- this way^ worked easy as, zero damage.
Attachment 257893Attachment 257893
Incidentally, this was one of those times, when i was sizing the case- it was tough- i stopped and thought about it, and continued.... shoulda backed off- relubed, or just thrown the case- will next time :)