Hi and welcome,
I normally shoot a Tikka with a 1-12 twist that likes 40 gr. bullets,I also have a Fab-10 with 1-9 twist that shoots the same load fairly well. ( haven't tried any other load in the Fab-10) I'm also a prisoner of Ca. If you live in southern ca. you can call "Larry" for more information regarding a Fab-10 at L&G Weaponary 1-714-840-3772 he will be glad to help you.
Oh, I almost forgot, the fab-10 and Tikka are .223 Rem.
Happy and safe hunting .. Emilio .. Pico Rivera, Ca.