I swab all my inlines with the alcohol/windshield wiper solution. Never put gun oil in the barrel when your shooting. In fact that same swab solution on a patch will remove any dirt and oils from the barrel before you load.

Work the patch in short strokes down the bore Then two dry patches and you're ready to load again. Also if you want to clean the 209 primer area on the breech plug, some simple Q-tips and that same solution will clean that out and make the 209 primers not so hard to put in and take out.

Like Triple Se7en pointed out, there is no way one can guarantee that if you shoot 2" high at 50 yards you will be on at 100 yards.