I seem to have a differing opinion on whether the bullet gets resized or not.
It would seem to me that any pressure exerted on the outside of the case would transfer to the inside of the case and then onto the bullet.
It doesn't directly act on the bullet but it certainly does inadvertently.
That being said, I'm with pinky on this one. Never had a problem with accuracy or anything from using the LFCD.
If you have a size issue though and want .359" or .453" bullets to correct a problem with your specific firearm, I wouldn't use a LFCD.
Common sense tells you it will make the bullet some smaller.
Otherwise, you are smart to use one, IMO.