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i have the same gun and had the same problem i went with a truglo muzzle brite system i love it. i shoot a williams on my black diamond xr and like it but prefer the new truglo one.
50.00 cabelas truglo muzzlebrite globe system, go to optics under muzzleloaders and it is in there it uses a peep site on the back with to fiber optic pins in it and a small dieamiter front globe sight i love it i have one being delivered for my black diamond xr in the next couple of days to replace the williams set up its good but you will love this system i am talking about it has made my groups get smaller and smaller as i go. and it is a super brite sight because it has the truglo sight pin wraped around the front globe under a plastic cover if you stretched it out it would be like 12" long instead of the factory 1" check it out.
fits great and you will love it go get yourself a big cow