I am no expert or professional in ammunition construction.
But from a purely observational/experience standpoint, I've noticed these factors effect plastic fouling buildup.
1) Gun cleaning. If a gun is not cleaned throughly after each use, fouling hardens and layers up.
2) Ammunition choice. Import stuff is a cypher as to powder and wad quality.
3) Handloaded ammo powder choice. Powders like Red Dot foul more and create more fouling/drag.
4) Handload wad choice. Known quality wads like Claybuster are made with specially formulated plastic and foul less. Imports? They often foul more.
5) Primer choice. Federal or CCI Magnum primers help to more fully burn heavy fouling powders, leave less residue and thus less drag on subsequent wads/shots fired.
These are my observations only. See your ammunition professional for details. Tom Armbrust is one.
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