I am having a rifle built up in this caliber. It is going to be on a stiller tac 30 short action, but used as single shot only. I will be shooting Berger 180 hybrids seated long. Does anyone shoot this caliber with this bullet loaded long and if so what is the freebore numbers looking like. Better yet, does someone have a dummy round I could buy off then to send to the smith? Thanks for the help.