Adrian,
Great post.........in your experience how much center density do you figure you lose on average patterning from a dirty barrel?

When I first started patterning my new Remington Supermag / ICSS Black Diamond Strike with the Hevi13 #6's I honestly didn't know the correlation between a clean barrel and tighter patterns. I assumed it was just luck of the draw shot to shot and that the choke/load was everything.

I was getting 180+ pellets in 10" at 40 yards (one was over 200 if I could redraw on a shot I pulled a bit high offhand) but these were after a dozen initial closer range shots to sight in the new scope.

Even a 10% jump in center density on a clean polished barrel will get me consistently and easily over 200 pellets in 10".

Is it safe to say that I can leave the sights alone, clean the barrel and simply expect more hits in 10" at 40 yards on the same POA?
Its a thumper now with a nice even distribution but if I can up it 10-15 or more % on center density it will be a no brainer 45-50yard max gun.