Have a 350 Rem Mag with 1 16" twist and it shoots 300 grain RNoses fine. Had a 358 Win with a 14" twist and it worked very well too. These were both very accurate guns. I often wondered if the 358 Win had a reputation for less than stellar accuracy because of a too fast 12 or 10" twist. If I was going custom I'd go with a 14" twist.
