Welcome to GBO!! :wink:
I'd call H&R and ask for it to be fixed, scope base mount holes are either drilled off center or the bore is off center, either one will require them to intervene. I suppose you could have a bad scope base, too. They can polish the bore while it's there. Their toll free number is in the FAQ and Help sticky.
An alternative would be to use Burris Signature Zee rings with the optional offset inserts and do the bore polishing yourself, see Chamber Polishing in the FAQ and Help sticky.
Tim