It is important that we get some info about the grouping. If the grouping is really bad, maybe the bore is so worn that a lot of pressure is being lost in gas blow-by and the poor old bullet is just falling out of the muzzle*. If the grouping is good, either a high blade has been fitted - ot the barrel is bent.
Now what was it I wanted to say. Ah yes, I remember -
PHOTOS PHOTOS PHOTOS!
*No joke, I experienced that with my first efforts with the Hannover "Pickelgewehr". The Minie bullet failed to obturate and landed in the grass in front of the target. About 1.2 meter drop in 50! I could just as well have thrown it at the target.