RE: Lee Collet Die
I use the collet die for my 223 in a RCBS and and like it .I went by the instructions screwed it in till reached the shell holder and screwed 2 full turns more,when I size I push down till the primer pops out ,turn the case 180 degrees and press down again,neck tension has been fine so far.
Really like it for these small cases.
You mentioned crimp? I don' t never crimp so I have no idea about it.