Hunt the rub line only if you can set up 20-30 yards above it in elevation and if your down wind.I find the best location to be the spot where this line is nearest to actual ridge top,it lessens the chance of your scent being detected. Be prepared to not see any buck till late in the morning but a buck on the prod can be seen at any time of the day. They're scent checking as they go the wind and theground so don't make them go nocturnal stumbling around there leaving abunch of scent with doing a bunch of unnessary scouting. I hunt these spots almost exclusively here in the Ozarks with very consistant results. I can expect a chance at the boss of the woods during the pre-rut but after he's occupied, the lesser bucks are what you'll likelysee. Again,the key here is to not let them know of your presence, it will really blow it for ya. Hope this helps you out a bit.