mounting

Trying to put a new(birthday present) Leupold VX3 1.75-6 on my T/C Encore muzzleloader. This is replacing a Nikon scope that I had used for 5 or 6 years. I'm using the same pair Warne Maxima rings that held the Nikon. So all I did was swap scopes. I have the elevation maxed out at the top and...