I have an encore and no matter what i do i can't seem to get this residue out of the bore. I tryed solvents like TC number 13, hoppes gun solvent, and also hot soapy water. I've run patches through the bore that are so tight they sqieck and they come out clean but i can still see a buildup in the bore. I do shoot sabots, could it be plastic build up? IF any one has any suggestions I'am all ears because I getting very frusterated.