This is a link to the old forums.www.buckmasters.com/forum
I don't think you can use Pellets or a scope.
Matter of fact I know you can't.
Have a buddy who hunts m/l Colorado every year he gets drawn. Last year I sighted in his Encore for him. Used the following recipe for elk with very good accuracy; 300 gr Powerbelts 120 gr loose Triple 7 3" high @ 75 yds 3.5" high @ 100 yds 3" low @ 150 yds
348gr Powerbelt Aerotip in front of 150gr of pyrodex pellets.