How good are they for producing straight ammo? I just picked up a Lee deluxe die set with the collet neck sizer for my 308. This is an upgrade from the RCBS standard full length sizer and seater I have been using. I noticed that the lee seater does not have a locking nut just a friction O-ring, and the seater stem floats inside. My question is this, is the Lee seater better for producing straight ammo than the RCBS?