With a good .670 choke, it is very possible you will get even better 10" numbers than you did with the .660 Jelly Head. Only one way to find out.
There's and old saying...aim small miss small.
Trust me when I say any good shooting turkey choke shooting Hevi-13 turkey loads is going to likely blow holes about the size of a softball or just a tad bigger to maybe volleyball size at 20yds. That goes for a .655 choke to a .675 choke and probably even up to .680.