There are several possabilities, a rough bore is one,do the cotten ball test if the cotten ball leaves bit of cotten snag up in the barrel then you may have to do some polishing or even lapp it. Patch and ball, if the patch is to thin or the ball to small you can blow the patches to doll rags. Theres a good chance if its a new gun with a cut barrel you may have a few sharp edges or burrs, if thats the case the fast remedy would be either JB bore paste or jewlers rouge and a good tight jag&patch and about 50 strokes. Lee