My son-in-law built one on a remington 700 long action with a McGowan Remage barrel. If I remember correctly he was getting 200-250 fps faster than a 6.5 Creedmoor with the Hornady 143 eld. He shot 2 antelope in Wyoming with it in October and it worked as it should, DRT. My only take from it all was that it kicked more than the Creedmoor and didn't kill any quicker.
