I'm looking for a set of .308 dies.I just bought a dillon 550 set up in 9mm.I originally bought it for .308 but decided to get in 9mm because someone recommended doing 9mm because they said it's easier to do and it would get me started and I needed it anyway.So I'm pumping out 9mm .My question is,can I use any manufacture die on the 550?I have a couple of hundred one time fired cases from my 700 and it's going back into that gun only.I know everybody does it there own way meaning in fl sizing and neck sizing.I do care about accuracy but is one way easier then the other for a newb?Is there anything wrong in buying a used die or just go new?I'll be using varget 175 smk 210 primers.