Precision and accuracy are two different things. You can shoot very tight groups in the wrong place - precise but inaccurate. You can also have impacts centered but widely spread - relatively accurate, but not precise.

When sharing adjustments with someone else, give them in MILs, not clicks — their turret scaling may differ. So the earlier example would be 0.5 R on a 500 m target, or 0.5 R / 0.1 D at 100 m.