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I would have to guess they are meaning bench leg bucks. They are found down around White Salmon and on the back side of White pass and I am sure many other places. They are deer that are cross bread with Muley and Blacktail. That is what I have always heard when I hear of a bench leg buck.
I would say that the Ellensburg area is about 50% Benchlag/50% Mule Deer, lots of overlap here.