There USED to be a problem with shooting shorter cartridges in revolvers chambered for longer cartridges.
This was a problem back in the days of corrosive ammo.
Firing short ammo in a chamber would cause erosion just in front of the case mouth, and this would eventually erode a ring in the chamber.
If longer ammo was fired, the case would expand into the ring, causing difficult extraction.
In modern ammo, there's no problem, AS LONG as you don't let the chamber corrode from lack of cleaning.
The best, safest, and fastest chamber cleaning method is to just buy a couple of chamber cleaning brushes from Brownell's.
Buy the bronze model, since stainless can damage or wear the chamber.
The brushes are made of an extra-stiff bristle that works better than using over-caliber bore brushes.
To use, push AND turn the brush as you push it through the chamber.
All fouling will be removed, usually in one pass.