RE: scope right for muzzleloader
First off whether you will need to use 150 grains of powder for the best accuracy is the first question you need to address. A lot of the companies sell these rifles with the claims of 150 grains of powder and super accurate loads. Well it just is not always true. All you do is burn a lot of powder, spray the target, and get a sore shoulder. When you drop the load down to about 100 grains the accuracy comes right in.
Whether the scope will take the recoil of the muzzleloader? Well there is one way to find out. Mount it. Shoot some stiff loads out of it. If it fails then you get a different scope.
You have a great rifle there. Good luck with it.