Free: Contests & Raffles.
Do what your rifle tells you. If it likes dirty, hunt with it that way.
Do you guys clean your rifles before hunting, or leave it alone after sighting it in? It seems to take about six shots for my rifle to start shooting good groups after a thorough cleaning so I was tempted to not clean it until the end of deer season.
Another thing to watch is cold bore shots and clean cold bore shots. Few rifles shoot cb shots exactly where the group is.