mine would be, when using the peep sight that must be removed in order to remove the bolt for cleaning, make sure you have locked it in for the sighting in you have done that day.
I once sighted in my rifle, going from a 150gn to a 200gn, raised the rear sight to where it was now supposed to be, put the rifle away, it was a wet day, so when I got home, I took it out and cleaned it good. Next day, I fired at a nice doe, 75yds away and completely missed her!! Saw the bullet hit the snow right under her!! I couldn't figure it out. When I got home, I noticed that the rear sight seemed to be in the same place it was before I had sighted it the day before. I had forgotten to turn down the locking screw!! Back to the range, buck that afternoon.