I have killed deer with the Cast Performance bullets and the Hornady XTPs. I have found that the XTPs do expand a bit within a deer, and usually leave a good blood trail. All of the XTPs that I have used on deer have exited.
The Cast Performance bullets that I have killed deer with have also all exited. As they do not expand, the exit hole is smaller, and usually, the blood trail is minimal.
That being said, I have found all of my handgun shot deer except one, a deer that was shot with the hard cast bullet. (It' the only deer that I've shot and not found.) The fault was not with the bullet, though. We followed the blood trail for half a mile before she entered a swamp. I truly believe the cause of the incident was poor bullet placement.
Both styles of bullet are deadly. The most important factor is bullet placement.
The REAL key to handgun hunting is PRACTICE, PRACTICE, PRACTICE! And, if you're like me, you're always looking for a reason to shoot more!
The Blade