Beaver Bill is one of the best and you can click right here
He makes his pipe hawks out of rifle barrels and you can still see the rifling in the pipe head portion. I've met him at Friendship, Indiana during one of the National Matches (blackpowder) and he's a regular vendor there. I've got one of his pipe heads somewhere and gave a finished pipe/hawk away to a relative as a gift. Terrific pipes and here's my personal favourite: