Like Mullet said, the more fouling, the more inconsistent your shots. Do you have a JoAnn's fabric shop, or a cloth world, or any kind of fabric shop there? And since I now have you on line, I have some foreign coins, some Italian, some French, some German, etc.
They are various sizes, are you still looking for some coins for your knife butts ? I had sent you some pm's but never heard back from you.
The next time you try to sight your rifle in, try to run a wet patch down the bore after you shoot, then a dry one, and then load, and shoot again, and see where you are hitting. Also get a good rest. Don't rest the barrel on anything hard, as it will cause it to jump. Put your hand under it, or a sand bag, etc.
Wayne