I have an Accura V2 in Nitride, and when I am shooting at the range, I swap out my breech plugs every 7 shots or so. I have two breech plugs I swap out so that each one gets equal use. I do this to maintain as much consistency as possible. When I do this, I run one, and only one, dry patch down the barrel while the plug is out, just to get the big stuff out but keep the barrel fouled, as I hunt with a fouled barrel. On a spotless barrel, there is a slight change in POI when compared to a fouled barrel, in my rifle. The one dry patch run through the barrel does not remove enough fouling to change the POI in my rifle. YMMV I do shoot bullets with sabots, Knight Bloodlines (220 grain/.458) and an orange Harvester Crush Rib for .458 bullets.