To be honest I had ignored the fact that I had fitted new scope mounts (Leupold) took the rifle to the range to sight in and dropped the bolt on the floor. Could not see any damage on the bolt. Then when I tried to fire it just went click so I thought it was down to me droping the bolt.
On further investigation I found that the front screws on the scope mount were a tad too long and stopping the bolt fully closing. Has anyone else come accross this?