I think (emphasis on THINK) that Claws are piercing damage and bones are weak to blunt damage (fists,cesti etc..) so I don't think they'd do that well, and why use these when CC are so much better anyway?
Do these have some sort of hidden properties? Because the ingredients drop off some really high HNM dragon monsters. They just seem a little underpowered to me. Maybe the additional fire damage is really good or something.