If 400 yards is your limit, try you hand at mill-ranging. I found that I could be very effective using a reticule to range out to 400-450 yards and was decent to 600 yards.
As for bow season, cant help you with that one... If I have a bow in hand it doesn't have training wheels, so no need to range it. Its gotta be close (sounds tough... but I still haven't shot anything with the stick and string
I bet you find it anyway. I always do.