Check out the link below. It shows the differences in the scopes from Leupold. One thing to notice is the 1/2” MOA on the Rifleman compared to the 1/4” MOA on the VX-I. Personally I would go one step up for the VX-II. Good luck in your choice.
http://www.leupold.com/products/Scop...ure_Matrix.htm