Like the fact your going with the 3-9x40.......I think I would go with the Bushnell, I don't know much about the new Redfields. (I'm Leupold fan myslef) Also don't bother with that BS that the scope companies try to sell, like scopes just made for muzzleloaders and slug guns, or the other BS like DOA or BDC reticle, these are just added gimmicks. Get yourself a rifle scope be it on a muzzleloader or slug gun.

Also look into the Bushnell Trophy line scopes I think they are being replaced by a different model, but overall the new model is the same, the Trophy line maybe cheaper in price, just for them to get them sold and out of stock

Best of luck !!!!