Good point I’ve worked on just about everything I can modify on the air rifle with the exception of any valve porting or barrel polishing. I’ll definitely keep the barrel polishing in mind. Thank youTo improve accuracy on an air rifle that has that tight of fps consistency you may need to work on the barrel bore or crown for imperfections, or how it is loading the slugs. Alternatively, weight sorting and matching the slugs helps with fliers. And also try running silicone lubed slugs to see if those are more consistent shot for shot.
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