I think these fellas are on the right track when it comes to adjusting your sights. Look at your other variables as well though. This may sound strange, but what are you using for a ball size and patch thickness? Do you have to use a short starter to get them in the barrel? As an experiement, try using a little bit thicker patch. I had a similar problem one time and for some reason, a thicker patch helped - go figure! It's worth a try. But as one of the fellas said, your groups are good so it could be just your sights need more adjustment as noted. Good luck and keep us posted on what you come up with. Thanks!