My older brother who is just now getting into reloading called me last night and said he took the husquavarna out to shoot (it was my dads rifle) and first round shot no issue 2nd round shoots but when he ejects he pulls the bolt back on a case head only. Total separation. I told him to take it to a GS as it sounded like the headspace was off. But then I find out hes using 30-06 brass cut down and necked up to 323. Any ideas? Its a mauser 98 action and douglas premium barrel.