I have the '3-9x40 Buckmasters Matte BDC' on a 350 Rem Mag. I think it's awesome, easy to see the BDC circles and almost dead on for me. I'm sighted in at 100yds and I use the top BDC at 200 and it falls 3/4" low, almost exactly as they said for magnum's. I'm sure it'll work the same for the Omega on Muzzle loaders.