I have a Leupold base and rings on my Contender and use low rings on it. I am pretty sure that I use low rings on both of the bases that are pictured in your other thread as well. If you are going to tap your Ruger anyway, I strongly recommend the TSOB mount. With the three ring setup it will hold your scope in place regardless of recoil. The TSOB was designed by JD Jones for use with his "hand cannons". I sent my SBH to his shop and had them install it, the rings were included.