Plastic shot cups tighten patterns versus old shells because the shot cup cushions the shot, reducing or eliminating deformation or scrubbing of the shot as it travels down the barrel. In my experience, plastic deposition is not a big deal. I've heard that modern shells pattern about one choke tighter than old shells, but haven't sween any testing to confirm that.
I shoot a lot of sporting clays, and probably don't need any special treatment more than once a year, when I spray the barrels with carb cleaner. Because our shotguns don't have rifling, cleanup is easy, and not required as frequently
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