Those who suggest flyers don’t exist simply haven’t shot enough in a controlled (indoor) situation. Or they have one of those magically flyer-free barrels, the one-in-a-hundred or -thousand that most of us will never get our hands on. On the other hand, some barrels just aren’t that accurate and they will shoot flyers.
It’s likely that all of these things are true:
- flyers happen due to wind, flaws or inconsistencies in the pellets, and internal ballistics in the airgun.
- solving flyers is therefore never done with addressing just one root cause, and even still it’s very hard to eliminate a root cause so much as reduce it. Sorting can help but it will never eliminate internal flaws that cause imbalance, for example. Single loading helps because it avoids creating external flaws.
- gun handling and aiming is always a factor. Parallax error can generally be eliminated and shot cycle variation can be controlled but often is worse than assumed. Trigger control is always relevant.
- even if the airgun has perfect propulsion, the barrel surface is always changing from shot to shot. Tiny bits of lead or lint or lubricant can cause successive pellets to accelerate and release differently. Cleaning matters but sometimes seasoning matters more.
The downside is there is just so much at hand and every airgun responds best to different solutions. No one philosophy works for all airguns.
The upside is there so much to experiment with and develop the most effective solution to your airgun and shooting situation.