OP, I see the thread was started about a month ago and resurrected yesterday. It was asked back on the first page, what do you want to do with it, what distance do you see the rifle being used on game, etc.
Next one for me in a Bolt gun is probably going to be a 6mm CM.
Was really looking hard at a 6.5 PRC. But I think the 6Creed is going to be the ticket.
For my gas gun im getting ready to do a 6Arc upper I have been wanting for a while.