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There will always be more blacktail that you don't see than do see...
The only thing I can add is that blacktail hunting in western WA is probably some of the most difficult big game hunting in the US. Don't be discouraged and keep at it.
Thanks for the replies, all, that's helpful.Do you think it's worth finding a "well-used" trail and camping it at sunrise/sunset to see if there's any foot traffic? Or would my proximity to the trail give my scent away too easily?
Some of what you are asking depends on the wind. If the wind is right give it a try. The well used trails are most often used by does. It doesn't mean you won't see a buck on them, but they will use other access or less used trails more often. It might be worth putting a trail camera or 2 up before the season and see what is using the trails you are thinking of.