How about roll out two barrel options: pencil/sporter contour in 1:8 twist, and Heavy varmint in 1: 7 ?
I think pencil will out sold heavy, but still lot of people need to have heavy barrel.
And please do not flute the barrel. Fluting with small ball head endmill takes to much time and efforts(cost); creating more QC issues(cost); and introducing more stress into metal (accuracy)