My dad had a cold barrel V-bull with his Long Branch No.4T and the No.32 REL Mk II scope. I've told this story before; he was enroute to a vintage rifle match but wasn't sure of his zero. There was another match the week before, and when he arrived they were already at 1000yds. So, out of the chest with a single swab pass to dry the bore, and choose a good looking round of DA Mk VII ammunition. Look at the tables and screw up the elevation knob. Take a good aim. Bang. The target goes down, and comes up V! No sense arguing with perfection, and he retired the rifle to the chest.