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Wil Terry is quite correct as most 22 ammo is completly lubricated like WWs lubaloy and dimensional tolerance on most good .22s is held to tight tolerance.
In addition some .22 ammo like CCI Stingers or Remingtons Golden bullet have a copper or brass wash that provides addtional fouling protection.
Even with the lubrication and coatings though cleaning is still required depending on the amount of fouling involved; and everything fouls to some degree.
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