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I'm not sure what this has to do with bullet casting. Am I missing something?
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Yes & No,some people use POLY-FIL in cast bullet loads to take up the excess space and position the powder up agents the primer for more reliable ignition especially with large capacity cases.
You don't have to worry about the POLY-FIL leaving any residue in your bore or gas system,it's toast as soon as you pull the trigger. Personally I've never had to use it for any of my loads,the powders I use like 2400,Red Dot,IMR-4756 from my cast bullet loads are not case capacity or position sensitive and have worked well with the calibers I use them in.
James at Ammosmith has so very good videos as well as Eric/IV888.