Of all the scopes I own, I like my Nikon Pro Sport 2-7x32mm. It just seems like the perfect muzzleloader scope. It does not cost a fortune. Has a great guarantee. 75 yrd parallex free, excellent light gathering ability, outstanding clarity, and so far has just been bullet proof.
I have it on a White Rifle, shooting large conicals, and even the recoil can't shake it. I do have Warne QD rings on the rifle and so far it has always returned to true zero when put back on. For the money I just can't see a better scope.
When I stalk the woods I set it on 2X and I can actually see the front sight in it. When I get to stand, I set the power for the situtation I am hunting. I seem to favor 5X for some reason.
As for the BDC I had them on two center fire rifle scopes I have. The joke to me is, while I paid extra at the time to get the BDC I have never used them. I just taught myself the proper hold over etc. I guess I never trusted them. I like a single cross hair in the window to concentrate on.