I'm kind of curious about ash as a stockwood. I was under the impression that ash, with its open grain, would be more sensitive to changes in ambient humidity then walnut or maple, and in consequence any rifle stocked in ash would more prone to problems with changes in the point of impact than one stocked in close-grained wood.
Ash always struck me as a good, durable stock for a utility smoothbore, but I didn't think it a particularly good choice for a rifle.
Can't find anything on the dimensional stability of ash, though, apart from an ad for wood flooring that states that it is "above average" (compared to what?), so perhaps my initial assumption is incorrect.