I am not sure what symptoms the fcd is supposed to "cure" I don't recall reading that anywhere in the literature. In fact modern reloading 2nd Ed by Richard lee states the fcd won't turn ammo made from Substandard parts or poorly assembled ammo into world record winning precision ammo just by running it through the die. It's a tool, and like other tools it can be used improperly causing detrimental results, I find it comical people want to blame the tool when they don't get the results they expected as a result of improper use.
I use the fcd, and with great success I might add. It takes some experimenting and tweaking to get it right but I use it and recommend it.
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