Here's the way I was taught to boresight and it has never failed me. if you have a gun rest this helps a lot. First pull out the breech plug and aim it at your target (start at 25 yards) looking through the open barrel. Try to aim the center of the barel at the center of the target. Next lock your gun in that position. Take a look at your scope crosshairs and see where they are in relation to the target at dead zero. I bet your are off the mark to where you will never hit the mark. If you are, adjust your sight to where it is dead center. Next load it up and fire off the rest as usual and make your fine adjustments so you get dead center. From there it would be up to you as to how far you would be shooting. As for me I like to be dead on at 100 yds as that is my farthest shot I will have during hunting season. Some guys like it 3" high at 100 yds to zero it at 150 yds etc. This technique will get you on the paper and pretty close. I take it an extra step and draw with a marker a crosshair on clear transparency paper and tape it to the front of the gun when looking down the bore in order to set it to zero. This is the poor mans way to sight in and has never failed me. BeforeI got into muzzleloading I did have a scope put on at Bass Pro and had the same problems, the guy seemed to have all tools and knowledge so I just wrote it off on the transportation from the store to the house as having bumped or moved it. If the scope is not locked down it doesn't take long for it to be off, and a liitle off is a lot when shooting at great distances.