The Collet die is a neck sizing type of die. The RGB dies and Pace setter sets,are full length sizing dies. Just follow the directions,that should be with the collet and it will come to you.
Case length gage,you really should have one !!!!!!!!!
To make case length checking simple,to start,get the ones from Lee . The trimmer and shell holder,plus the trim gage,for you chosen caliper. You just use these to check and trim the cases. The proper measurement is built into the trim gauge.
Check the Lee on line site.Lots of directions for their products,on line.<img src=icon_smile_approve.gif border=0 align=middle>

Mounting Man/in PA.