It is easy. Give the die a very good polish after opening it up. I only use mine for powder coated bullets, but they work just fine with uncoated lubed bullets too.
Gotta make those bullets fit the throat if you're looking for precision. You already know what too big does, and too small isnt prefect either. Also, a LFN style can be more forgiving to those steep transitions in the FA cylinders. They are all I cast and shoot in any of my revolvers. The WFN styles have been more problematic for me accuracy wise, and I have zero SWC style molds around. Not saying a WFN or SWC won't shoot well, I just have great luck with all of my LFN molds.