If you go to a regular HP Rifle match most of the shooters will have their nose touching the charging handle. In exactly the same place on the handle every time. Just to keep your head position the same every shoot. Also if you cant the rifle differently between shots in can make a big difference. Just a couple of things I would throw out there that are a little different.
BTW I will never put my nose against the bolt on a 300 magnum!
