If you were building a 6.5prc to shoot factory ammo what twist?

The factory Hornady 147 ELDM shoot great out of my 1:8 twist.

Edit - even hand loaded 156 Bergers shoot well out of my barrel. 24” proof. Would a 1:7.5 be more ideal for those? Maybe so, but I’m not sure they would shoot any better than they already do.
 
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