Hello and welcome to the site. I really don't think you need/want the 6" of eye relief for the muzzleloader, however, you probably will not utalize the 9X either. I know others on this site have posted good results on the bushnell line of mid priced scopes and your muzzleloader would shoot fine with one. For the 5 bucks I'd opt for the 3X9 just for the larger dia optics should give slightly better low light gathering.