One very good reason for not using cast bullets which project into the case is accuracy. Accuracy regularly suffers since hot powder gasses will press on the base of the bullet, deforming it.
This obduration can also raise pressures, since the bullet must be squeezed back to groove diameter upon entering the rifling.
Another very good reason is that a 170 cast bullet is more than sufficient-if properly cast and lubed-to handle anything the 30 WCF is suitable to hunt.
