I cast all my rifle and pistol bullet and have for 20+ years,I've been coating my own bullets for about a year with both epoxy and polymer base powders,I get better coating results using my ES gun than I do using the tumble lube method with air soft BB's.
Before I tumble lubed all my bullets and still do some because it's just fast and easy an my tumble lube mix dries fairly fast and hard and doesn't leave much residue in the seating die over a long period of time,the PC'ed bullets I do leave none.
I like the PC'ed bullet for long term storage as the coating is not effected by either cold or heat like some lubes can be if stored where condition are not always ideal.
I don't have any issues with buildup in my rifle and pistol bores using lubed lead so naturally the PC'ed bullet are just as good and have never given me any issues. My main test will come this spring when I start testing the PC'ed bullet in my SKS rifles to see if they leave any residue in the gas system. With regular lubed lead you can get some buildup over time on the face of the gas piston we shall see if that changes with the PC'ed bullets,I suspect it will.
A few bullets I've coated and use.