Those bullets usually look like they could be reloaded even after passing through bone and meat. That's the point of using them. As the Cor-Bon website says: " There is no expansion with this load and is best selected when bone breaking power is needed"
If they were soft points I'd agree with you, but those super hard cast bullets perform more like a solid. And again, even if they deformed, since they are exactly the same otherwise, more is better when it comes to SD. As I said, it may not matter. If the bullet goes through and whistles off into the bush, it ain't an issue, obviously.
