I took the new No 4, Mk1* to the range today, got three shots off and then the bolt jammed. Couldn't rotate the bolt to extract the cartage. Went home and after much fussing I discovered that by pulling the cocking piece back to full cock I managed to get the bolt to work again releasing the spent cartage. Testing with snap caps seems to indicate that everything is fine. I am going to re-clean everything as the mechanism is still a bit stiff feeling. I think that this rifle has not been fired much recently and that may be an issue. Thoughts?