when DVC was created, it meant what it said. my first match was in 1984-pre-chrono days. we used a pendulum to determine power factor by matching 230 hardball. once we got chronos, the power factor was like 175 then. it has dropped ever since. we keep dropping the PF to get in new calibers/guns, etc. to me that diluted it. and yes, i remember loading 160 gr 38 super bullets to major, unsupported barrels, superface, 9/25, etc. and don't get started on plates.