You should adjust the scope cross hairs to the point of impact of the bullets. If the bullets were hitting to the right you must adjust the cross hairs to the right. Adjusting the cross hairs to the left caused the bullets to go even further to the right.
The barrel determines where the bullets go so the shooter must adjust the scope to where the bullets go.
That is how it works in theory, but most scopes I have used are marked accordingly so that if you crank the direction labeled "right" it moves the point of impact to the right. If Perleyu was moving the cross hairs left then he was backwards but if he was cranking the dial in the direction labeled "left" he was probably doing the correct thing.