So my brother had a miss a couple weeks back at 25 steps with my muzzleloader-TK2000.  His son killed one with it two years ago, my son killed one with it a week later.  he has a side by side ML that he missed a jake in the fall with.  I told him mine was dead on, take it, and then he missed a longbeard. 
So it got me to wondering if it was the gun or the shooter.  next post I will put a pic up of the pattern at 25 yards.