Yep, same here...I do run another dry patch down, as I do for the first shot...

I have a theory that guys that claim that they have to foul the barrel before getting groups are not doing this...
I've never had a muzzleloader that I couldn't get to group with a clean bore...

Another point...the reason I started doing this, about 8-9 years ago, I was swabbing between shots with rubbing aclcohol, drying bore and shooting....The gun would group for about 4-5 shots, they they went to heck...I realized that the bullets weren't sliding down the bore as before...Added this step and it corrected the problem...