RE: muzzleloader scope
With muzzleloaders you want to keep shots under 100 yards,especiallyat dusk. As far as a scope,a 3-9x40 is the best all around power.
A few good affordable scopes to look at:
Nikon Prostaff - $150
Vortex Diamondback - $175
Burris Full Field II - $175
Leupold Rifleman - $200
If youwant to zoom them in more, a4.5-14x42 is probably the most power you will want. The Nikon Buckmaster andBurris FF have the 4.5-14, and Leupold Rifleman has a 4-12x40, and all run around $250.00
To go higher in power you have to go with scopes with more expensive lenses than above, which puts you in the $500 and over range.