Try the 6br.com site they have alot of info there on the 6.5 there is a tab on the left side of their homepage to direct you to it. Or I can e-mail you what I found to work.
For 600 Yard With A 9 Twist I Would Shoot 123 Scenar And 130 Grain Norma Or Berger. My 8.5 Twist Does Fine. My Brothers 9.5 Twist Did Not. Noe Experience With 9 Twist Just Guessing. Coopers Tipically Have A Nine Twist. Maybe They Shoot The 139 To 142 Just Fine.roninflag