Get a proof barrel, pick whatever action you like, im partial to the iota kremlin stock but it's all personal preference, trigger if your choice somehow i got Huber 2 stage match triggers in my rifles, id go for 6.8 western for caliber
I have a 28-260ai with a 7.5 twist I've tried the 170 eol and they shot great but the 145eldx have the best accuracy and performance on hame has been exceptional so I have trouble wanting to try other bullets