I will chime in here on the not cleaning the rifle as long as you are not shooting corrosive ammo (don't buy that crap), its okay to not clean the rifle between the sighting in and hunt. I personally do this all the time, just because I do not see a need to scrub that darn thing then get it dirty the next week. Now I still do not see a difference between a dirty barrel or clean barrel in my two main rifles. These are lapped barrels so that could be the difference maker who knows. As for my other rifles I have not shot them enough to tell a difference but if your rifle likes a dirty barrel leave it dirty until after the hunts over.
?If men were angels, no government would be
necessary.? John Adams