So I am thinking about starting to neckturn and was wondering if I were to neck turn enough just to clean up the out of round brass will this cause issues if I am not shooting a tight neck chamber? or how tight of a chamber neck can I have and still fire factory brass? I know this depends on a lot of factors different brands ect. ect. And last but least I am planning a new 223ai barrel and besides it being just preference is there any befenits in having a 3 groove over a 5 groove barrel or vice versa. Thank you in advance for taking the time to read this incoherent rambling.