Yep, legal to shoot sabots using pellets and a scope when hunting with a muzzy during a regular centerfire rifle season.
In my hands, an inline with a copper covered, plastic tipped bullet is not any more inherantly accurate than my T/C renegade shooting maxiballs. It is easier to use and clean up, but is not more accurate. So I think "primative" is not the reason they restrict. Reduced ability to harvest during the rut is the reason they don't allow items (such as a scope) that would extend my range and increase harvest numbers. And yes, there are guys out there that can shoot almost as good with open sights as with a scope, but I am not one of them, and neither are most hunters out there. My current max range is 120 yards with my inline using fPBs and BH 209. I am sure with a scope, I could extend that to 200 yards.