Millet supplies directions with their angle lock rings to use a 1" tube or rod mounted in the rings to align the rings to the base at initial installation.
Leupold may or may not suggest the same procedure, I have never used their rings.
Given that the H&R base is a single piece of machined aluminum, things should be fairly square, but ...
I used a short piece of 1" dowel rod, clamped the rings to that, then mounted the rings to the base. Seems like cheap insurance, rather than bending my scope tube.