There could be many factors that caused the flyer. As Texashunter 58 said and as I do also, I clean between shots with denatured alcohol and then two dry patches. I also never shoot pellets. I am not saying there is anything wrong with them, they just are not for me. Besides their cost, then you have to remember how many of this weight and that weight make your load. I use loose powders. No matter if it is Pyrodex RS, Triple Se7en, or Pyrodex P. My Staghorn likes 90 grains of powder. My Black Diamond likes 100-110-120 depending on what I am shooting. I find it easier to use a clear cut off measure.

A person who shoots a great deal also told me something else about pellets. Whether or not it is true, who knows. He claims you should be careful seating the projectile because you do not want to crush the pellets. He said it changes their burn rate. So this means you have to be very careful how much pressure you are seating your projectiles at. The same is true for the loose powder. To get the best groups try and seat with the same pressure each and every time.

One last thing to consider is, how long are you letting the barrel cool between shots? Again, I have no proof this makes a difference, but I was told to let the barrel cool between shots. So I do. After I shoot I open the breech striker, swab out the barrel, then set the rifle down and go check my target. After I return I then reload, letting the barrel have a chance to cool down.

I shoot the Hornady 240 grain XTP's and have great luck with them. I also shoot their twin, the T/C 240 grain XTP's and they both shoot fantastic.