My dad used to cut the dead American chestnut snags where we lived in east Tennessee in the 50s and make wormy chestnut lumber for picture frames. The wood is soft, much softer than maple. There is a TN rifle in the Lenor Museum in Norris TN where I grew up that is stocked with chestnut so it was used for this purpose.
In a previous thread where this was discussed, one person had stocked a rifle with chestnut from salvaged barn wood (I think), they found it soft but usable.
Historians have since recalculated the abundance of the American chestnuts in America before the blight, they were plentiful but didn't comprise 30% of the trees in the forest like was once stated. I think the figure is around 10% after the recalculation.