Since your looking for a starter muzzleloader that is not too pricey, and you want to put a scope on it, I might suggest a H&R Sidekick in .50 caliber. .50 caliber is the best all around caliber especially in the modern in-line muzzleloaders. If it were sidelocks, we might talk different calibers.

Another one you might look at are the Knight Wolverine 209 or the Knight Disc. Both of them are excellent rifles. Mounted with a scope they are excellent sabot shooters. With practice ranges of 150 yards and further are very possible once the right load is found.

Another excellent rifle for starting is the Thompson Center Black Diamond XR. I have one and personally recommend the rifle for accuracy and quality. Check ..Bass Pro Shop. They were selling them for $200.00 a while back.

Depending on what you want to spend, there is a rifle to fit your needs. Let us know a dollar figure and we can put on the right track. Also some of the posters will offer suggestions for a good scope. I use Bushnell products. There are other good brands out there for the money....Sightron, Millet, Bushnell, Nikon, and others....