Bore Snakes are great for a quick superficial field cleaning - but when the gun is gotten home it should be properly cleaned with a rod, bronze brush, cotton patches and solvent.
If you THINK a gun is really clean after using a Bore Snake, just see for yourself what comes out after a conventional cleaning (after the Bore Snake is used). Bore Snakes have their purpose but it should not be confused with a final cleaning before storing the gun - just my opinion of course.............