On this topic there is more to consider than just twist, my first 6mm Remington was AI'd. my gunsmith at the time talked me into a PacNor 1-8" twist 3 groove barrel.
I never even once had a Hornady 105gr A-Max make it to target, they would blow-up coming out of the barrel, the 105gr Berger VLD worked well for a few hundred rounds and they started doing the same thing. the rest of the barrel's life was with the 107gr SMK.
I have a friend with the same chambering, different reamer, different gunsmith using a 1-8"Krieger 4groove barrel that is starting to blow up bullets also.
Makes me cringe a little on threads like this when people suggest to twist it as fast as you can and there is no down side. IMO with the case capacity of a 6mm Remington I would go with a 1-8" twist but make sure you get a 5 or 6 groove barrel.
