If you want to go above 85gr then definitely get the 1/10 twist. The 1 in 12 will handle 80's I know because I have shot quite a few thru two of them.
"Anyone taking up handloading necessarily plays with unknown factors and takes chances. But so does anyone who drives a car,goes to a cocktail party,eats in a restaurant,or gets married."

Jack O'Connor 1963