I know most people are aware of this and it has been covered many times, but if you get a miss fire, hang fire, click of the firing pin or anything that is unusual, wait 60 secs keeping the rifle pointing in a safe direction, then.
REMOVE THE BOLT AND CHECK THE BARREL FOR OBSTRUCTION.
This was highlighted to me last night again when lamping.
Shot one rabbit, cycled the bolt for the next, then 'click', there was no noise except the firing pin BUT the primer/powder had produced enough power to lodge the bullet in the rifling.
Obviously if I hadn't checked the barrel and fired another round the results would have been severe.
As usual this was cause by a split in the case neck causing moisture ingress.
After checking 300 rounds this morning over 30 had split necks!
Please be careful...