MP,
Since you know where the elk hang out in septemeber, I would start there first. If things dont pan out in the first location then check the spots you have been seeing the bulls. Checking for rubs and scrapes will let you know where they hang out duruing the rut. The past two seasons on the eastside the rut has started a little late for archery and fell into late september early october. In my experience elk only move because of five things.
They are,
human pressure,
snow,
extreme heat,
water, and
food.
If the area is not highly pressured, plenty of chow, water, and no weather events to kill the food or water then my guess is you have done your homework pretty good to this point. Since you plan on evening and dayoff hunts you should try periodic check ups on your location. This will allow you to get your timing down and figure out a good spot for the opener. I used to go once a weekend when I bowhunted and I would bring a target into the mountains and pratice shooting while I was scouting.
Remember deep quite breaths when you draw on that 7 x 8. THHPP WHACK! CRASH! CRASH! CRASH! HE"S DOWN! HE"S DOWN! HE"S DOWN!
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For some of us, a bad day of fishing is a bad day at work.
j7 2012