You got the one rifle that really stikes my fancy...
Scopes.. depending on what you want to spend.. I use a Nikon Pro Staff 2-7x32mm which is about $169.00 . Another good one is a Leupold VX-1 2-7X33mm. These two are shotgun/muzzleloader scopes. Some people go with Nikon Omegas, Burris, I even use Sightrons, Millets, and Bushnells, but I would not recommend the Millet. I think the scope failed me. I have to pull it and throw another scope on that rifle to be absolutly positive, but with that scope it will not group. Without it, I can clover leaf them at 50 yards.
From all I have read on your KRB7 they will shoot conicals well, and sabots. So I will be watching your range reports to see how it is doing..
Good luck with that rifle.