Re: setting up lee collet dies in rcbs single stage press
You can't push the shoulder back with the Lee Collet, it is a NECK SIZER. To push the shoulder back you get a Redding Body Die to use in conjunction with the Lee Collet or just use your full length die and put up with the expander, increased runout and lube in the neck.
For your new brass just use the Lee Collet to round out the neck and shoot. Then only neck size for the next 2 or 3 loadings until the case gets hard to chamber, then worry about pushing the shoulder back.
Again, there is absolutely no reason to use both a full length die and a collet sizer one right after the other. Use one or the other
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