With repsect to the part of "clean" that has to do with powder residue (rather than lead, lube or unburned powder granules), I think it is more a matter of asthetics than function EXCEPT for ammo intended for auto-loading guns. Ammo that leaves a lot of residue tends to make semiautos cycle slower and sometimes they can ge so dirty that they fail to cycle (feed), especially with light target ammo. This is true of both gas operated guns and recoil operated guns, including pistols, shotguns and maybe rifles (although really light loads in gas-operated rifles are usually not possible).
SL1
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