Here's how I use the Lee FCD for accuracy, I'm not trying to push it on anybody or saying that what anyone is doing is wrong, I love reloading and I have spent a small fortune on the latest and greatest and 30 years later I have come full circle and am almost where I started finding I can do a lot with a little. Anyway The Lee FCD, It comes with instructions and they work fine set to those specs but here is how I use it to "Fine Tune", Back the die way off and raise a round, screw the die in until it tightens up against the round, (Hand tighten really snug and I take a fine line sharpie and mark the die, lock nut and press at this point for reference), lower the round and give it a 16th to 1/8th or so of a turn, ( I prefer to cam over doing this with the Rock Chucker press so I know I'm consistent ) it may not look like it did anything but I assure you it did, crimp a string of however many you want and see if it helps, if it didn't give it another 16th to an 1/8th of a turn in and repeat. You can take bigger swings if you like but I don't .The way I use the Lee FCD its the same as finding a powder charge or seating depth. Once again I'm no professional and I'm not a competition shooter I'm a hunter who loves fast accurate rifles and this works for me and i use it on everything I load for, I have seen it help various calibers and I will say that I personally have never seen it hurt one in any way, , I do a lot of unconventional things from the Case Lube or the Dies I like to use some folks think I'm crazy I reckon, Once again this is just how I do things, I just want to say this again so it doesn't get all twisted,
ButterBean