It is always hard to advise people on these sorts of things in case it goes wrong. So I will tell you my experiences and opinion but please take them with all due caution (make your own mind up and understand everything is a risk).
I built all my 6.5*47's thinking I would try and drive the 140 class bullets at 2800 fps (and kept trying) so went with the 8 twist but ended up settling on the 123 and 130 anyway in each and every one (and all people I know did too). With hindsight in mind I probably would have gone with an 8.5 twist myself and personally think you should be a very happy man if you went that way
![Very Happy :D](./images/smilies/icon_biggrin.gif)