Any wood the customer wanted was available. However, most of them were either Walnut or maybe Beech.
Do you know if your rifle was purchased by a private citizen, institution, government, or society?
I've seen some of them with incredibly figured Walnut, straight grain Walnut, and Beech, and some with exotic wood, that were special order.
Most of them I've seen were straight grain Walnut, or stained to look like Walnut.