Every fall I see a wave of scoped .300 Win Mags with a few rounds through them up for sale as a package deal, usually with a "you save the tax!" line somewhere in the description - they rarely sell at that price. The ones that stick around are the ones that won't negotiate on price, usually.
You are almost always better off selling the scope separate (especially a Leupold as they retain value well) from the rifle, but include rings and bases with the rifle along with the "save on taxes" bit. If you include free shipping, that's probably a couple hundred in total value (retail taxes, rings/bases, and shipping) and you might sell quick in that case.