Loaded them up using Norma URP 64gr, 64.5 and 65gr all shot pretty well. By my calcs using Quickload and my measured case volumes, 64.5gr of URP is near max pressure, so I settled there.
Went back and tried both bbls today. Last season they were regulated for 250gr Lapua Naturalis, so I was hopeful I would not have too much to do, but wasn't too confident.
Shot this (I don't know why it seems to be rotated counter-clockwise). Both shots form the bottom bbl are there in the blue...... I'll chrony the load to be sure it is travelling OK - but I think I'm done.
