Matt, there is a simple dodge to achieve a "semi-scraper" effect. If you are firing a flat-based bullet, place a piece of lubricant-saturated wad (that's high-falutin' technospeak for a wax-soaked piece of card punched out of a beermat) in the muzzle and start it, then place your bullet and drive both together down the muzzle until they are seated. This scrapes a lot of crud DOWN the barrel, so the seating point of the bullet is raised somewhat, The crud is then shot out with the bullet. Not as good a proper wipe, but saves time!

BTW what is a CW rifle? Clockwork?

Patrick