Even for a self-loader, the Lee Collet Die in combination with the Redding Body Die gives you the straightest, lowest runout case you can get. Once you have that, nothing beats the Redding Competition Seating Die for straight seating of the bullet (see recent thread on this topic).
As far as trimming goes, if you neck-size-only, you don't need to trim because case growth happens when you narrow the case body in an FL or body die and then extrude the shoulder until the datum is the desired distance from the head ("set" it back), which feeds brass from the shoulder into the neck.