Is the hole straight through? I would try to save it by filling with epoxy and saw dust and maybe in-setting ebony, pearl or coin on both sides. You know us farmers, we never throw anything away.
Still a great job and the gun has a story.I've used that trick before on guns and wood working projects. This is crushed in pretty good so I doubt it would work. He had a 5/16 bolt, washer and nut cranked in pretty tight. That's fine for small dents but once the fibers are crushed it's a done deal.