I bought these ShockWaves a year ago. The rifle has been fired about 50-60 times. I try do do a good job cleaning the barrel. I use boiling water with dish detergent. First I swab the barrel with cloth patches until they come out clean, then I use a 20 ga. bronze brush, then a couple more dry cloth patches. Is there a better way to clean the rifle. I'm using 2/50 gr. Triple 7 pellets and Winchester primers. Is there a source for the Harvester sabots?