Worst .22 barrels I've run across were one that's the owner had cleared mud dauber nests from on several occasions by just firing a round through it leaving half a dozen rings in the bore. Another was a very old rifle with very soft steel barrel that had a jugged chamber from firing modern high speed shorts. Some of the Hamilton rifles had brass bore liners to avoid excessive rust from corrosive or BP loaded cartridges, these can also jug the chamber when using modern ammo.
One old Winchester model used a non ferrous alloy barrel that was advertised as rustless. It wasn't stainless steel but looked like it. These are also soft compared with modern steel barrels.
Over use of a cleaning rod will trash an old .22 RF barrel. I normally use a cord pull through.
When I do use a cleaning rod on my Marlin 99 M1 I insert a pistol sized bronze brush at the ejector port ease the rod down the bore and thread it on then pull the brush up the bore, followed by patches on a cord pull though.
I make the pull through using some thin nylon cord I found in a salvage store long ago. I crimped split lead shot on one end and rolled them till they could slide down the bore easily when inserted into the chamber. When the weighted end slides out the muzzle I insert fresh patches in the looped end and pull it through being careful to not touch the crown.