I built a 7 PRC for ELR. I had a Krieger barrel installed on it 32" long for more velocity. Using the Satterlee method accuracy node showed 3096 MV I was hoping for 3150. I am using RL 26 and ELD M 180 grain bullet. Charge is just 3 tenths above Hornady manual max weight load. Haven't got to bullet seating depth yet.