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I've always liked hunting Blacktail in the rain, seems they stay out in the open more. Rubbing against branches and leaves, I believe, gets them much more wet than rain running down their sides.
Other than the peak portion of the rut, The day after a huge rainstorm or snowstorm seems to be when I see the most "Daytime" activity for pressured game animals. A good 2-3 days of being holed up in the timber trying to stay out of the weather and the first break they have puts them out and looking to make up for the meals they missed