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By the sounds of this, you will soon be casting and coating your own. Embrace this eventuality.
I used to load WC in 44 magnum. A somewhat frustrating proposition. One of the leading frustrations was how the lube would migrate and build up in the die. Given how its a flat punch meeting a nearly flat bullet nose, all available space would be quickly occupied by lube and jack up the seating depth. All designs will do this, but WC happens the fastest.
sometimes as few as 15 rounds before I had to scrape crud.
since coatings ... no such issue remains.
If you're doing everything right, lube buildup in dies will be minimal and not enough to affect anything adversely until you've done many, many hundreds of rounds.