RE: 3-9 or 2-7 or 1.5-6 power scope for muzzle loader?
I would go according to use, for all around shooting a 3X9 is nice for normal range hunting a 1.5 gathers more light and with the same size front lens [the objective lens] you can see in dimmer light; a 2X7 is a nice compromise if it has a very large Objective lens. Lee