I was hoping your trade knowledge would come in useful. Thank you, I have experienced this a couple of times and wondered what it was. Folk borrowing my rifle afterward seemed oblivious (cooled down?). Only just got hold of a cocking tool to allow me to open up the bolt (well, to set it again afterward) but happy I don't have to.
Still takes the barrel out of the lock of the barn door at 1,000 yards in a stiff breeze though, which is all I really care about