I reload only straight wall pistol and use 3 die sets. Lyman are my preference dies. In 25 yrs my reloads have never had a problem with the crimp/seating in one operation. Setting up a crimp/seat die is no more difficult than doing it on seperate dies...yes, I've reloaded both ways. Regardless, if you are a 01%r that finds a malfunctioning gun due to using a dual stage crimp/seat die then try the 4th. Otherwise I think it's more hype than necessity for most of us.
bc
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