RE: Which scope for my rifle?
Welcome to the forums aaronkash!
With good quality optics, a 40mm objective is just as good as a 50mm objective. For most hunting rifles, a 3-9x40 is an excellent choice. Leupold is a good brand. They have the best eye relief of any scope I have ever shot. Gloss is a shiny black and matte is about as shiny as most rifles. As far as duplex vs. wide duplex, that's just up to personal preference.