I agree with Jimmy CK.
When that pesky flyer becomes more often then not, I decide it is time to clean it out! Usually it solves the flyers for me. It seems different with air guns then powder guns. With the leading of the barrel it gets clogged in the air rifle after a while and affects the accuracy.
With a powder burners, most guys make the mistake of cleaning it after sighting in for hunting. For example. They shoot the rifle, adjusting the scope to get dead center. Then they go home and clean the barrel removing all the leading that was deposited to get the barrel to hit where they wanted. True, it is not a big deal for 100 yds, but for a long shot at 250 out, it can mean the difference of well placed hit, or a mortal wound that can take days to kill the animal, after running off to disappear.
Now most true long range shooters (800 to 1000 yards) will clean their barrels rt at the range and keep getting their scopes sighted in with the cleaned barrel. Most, not all mind you. Those who strive for long range as well as accurate do this. Ask a military sniper what they do. (if they"ll reveal it)
But this is a subject for another topic and PB forum.....Sorry