I have no experience with Sightron, but they come highly recommended in the link below:
http://www.chuckhawks.com/scopes_muzzleloaders.htm
I almost bought a Sightron but opted fora Nikon Buckmaster 3X9 from Ebay for $132.00 and I really like it. Very bright and clear with a lifetime warrenty to boot. I really can't imagine needing a "better" scope than this one for shots that will rarely exceed 150 yards with my Omega.
I also picked up a new Nikon Prostaff 2X7 on Ebay for $97.00 for another gun. I hunted with the gun this past w/end and was very impressed with the clarity of this "low-end" scope. The eye relief from both the Buckmaster and Prostaff is good (3.5 inches plus).
Can't help you on the 1X issue. Good luck.