If your rifle was shooting good before with the same ammo I would try playing with the scopeto see if it is the culprit.
Try this.
shoot 3 shots (1 min between shots)
move scope 12 clicks up, 12 clicks right - shot 3 more
move scope24 clicks down - shoot 3 more
move scope 24 clicks left - shoot 3 more
move scope 24 clicks up - shoot 3 more
move scope 12 clicks down, 12 clicks right - shoot again (you should be back where you started.)
If not, your scope may be faulty.