That is false. Tolerance stack does occur even with components marketed as "precision" or "match grade". Generally the tolerance stack is narrower, but it still exists.
Originally Posted by Exsimguy1
If your sizing die sizes the case appropriately so the carbide ring in the FCD doesn't touch the casing in any manner, then yes. A very good taper crimp can be applied with the seating die or in a crimp only die for those that choose to seat and crimp in two separate steps.
all of your sizing and belling would happen in an appropriate/predictable manner, the bullet would seat normally, and then the only function of the FCD would be is to apply a very good taper crimp.
As a commercial reloader in "real life high volume loading" for local customers, my Redding Pro Series dies make ammunition within SAAMI dimension and have never failed to chamber. Never had the need for the FCD.
But now, however, mix in all the variables associated with "real life" high volume loading, and that scenario changes, sometimes quite a lot. The FCD WILL squeeze a round with the discussed faults to the proper SAAMI dimensions, so it could be fired.
Hmm, you stated "the FCD will squeeze a round with the discussed faults to the proper SAAMI dimensions". So that is a coverup for not being diligent in loading methods and techniques. If one were diligent, the alleged need for such a die, would not exist. People should focus on assembling properly dimensioned, safe ammunition with standard dies and methods that worked for so long, rather than rely on a die promoted to "iron out" mistakes in process. That's my point. If you need a die to size your ammunition after you load it, there's a problem with your components, your dies, or your process that needs to be addressed that shouldn't be swept under the rug with a die touted to fix it all. That's not teaching anyone anything about handloading process and quality control.
It is NOT a crutch, or a cover up for not being dilligent in your loading method or techniques.
If people knew what they were doing, they would have no need for the FCD.
However, to degrade it's use by people who know what they are doing, and the results therof is close-minded.
People can learn to assemble quality ammunition instead of slapping components together and then running it through a "make it all better" die. That isn't teaching them anything about the process and about quality control. It teaches them nothing and they don't learn anything.
People can say the problem doesn't exist....
People can say the solution to a problem doesn't exist..
OR they can try to find a solution to the problem...
It's all part of learning.