Yes wood has been used in a lot of different ways in ammunition. Blanks, rifle grenade launcher blanks, shot loads, even for artillery drill rounds. the picture with the 6 .45-70 show some of the different uses the 4 on the left are all shot cartridges the fifth one is a small wood capped blank and the last one is a .45-70 Rabith a wood sabot on a small lead ball, i think it was for small game but do not remember at this moment. The other is a pair of 3 inch 50 caliber navy anti air practice rounds used for loading drill, the wood metal combo even had a practice fuse for fuse setting.