You are correct to seat and crimp (remove belling) in two separate stages. There are a few things to consider when using the Lee FCD. I load for 9mm so adjust numbers for .40. Depending on how it’s adjusted, the Lee FCD does indeed remove the belling. It also “post-sizes” the entire round. It’s got a carbide sizing ring right at the mouth of the die. And if you’ve slugged your barrel and are shooting a slightly oversized bullet for a better gas seal ( I use .356-.357, in 9mm the average bbl diameter is .355-.3555 and mine slugged right at .3555 ) the Lee FCD will actually size the entire round to make sure it’s within SAMMI? specs for a loaded round, thus reducing the bigger diameter that your going for and creating all kinds of problems like poor accuracy, smoke and leading. This problem is more pronounced when shooting plated and lead rounds. The Lee FCD can be a really great check to make sure that everything is gonna chamber check ok, if the situation calls for it I opted for the Redding Taper Crimp die to remove the belling. Sent from my iPhone using Tapatalk