If you have a 721 in 300 H&H, that is a pretty nice period-specific rifle that more than a few guys would like to have. If it were mine, I would find a good scope of the same vintage, Bausch & Lomb, Lyman, Redfield, Weaver, something from the same era, and never look back.
It will make a really fine hunting outfit, and will only increase in value.
Ted