I have no problems pulling the hammer back on my newly-aquired Omega. I have a 3-9x40 scope mounted on Durasite medium rings and Durasite one piece base made for the T/C muzzleloaders.

My scope has a pretty good size eyepiece as well (Zeiss Conquest) and I still have no problems with clearance or getting on the hammer.

If a person were to use low mount rings I could see where the clearance would be a little tight......