Not all scopes and guns are the same. Your 50mm scope on your rifle may work just fine with these rings. As others said, as long as you can adjust for proper eye relief and the scope is not touching the barrel or receiver anywhere all is good.
Even though they both may have a 50mm lense, different scope brands will have slightly different size outside diameters on the objectives. Some have a short taper from the tube while others have a longer more gradual taper which can matter.
A heavier bull barrel will require the scope to be mounted higher than a thinner barrel.