While it could have been the individual scope; the Redfield 2X7 40 mm that I have in the drawer lasted only 2 months before recoil took it out. I keep it to remind me not to waste money on an other one.
I buy Nikon[usually the OMEGA] now and i have a Leopold and a Bushnell that have held up well.I do not believe the design of a Redfield is quite right for a muzzle loader but I have heard they do quite well on a cartridge gun.